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first

美 [fɜːrst]英 [fɜːst]

det.第一位的，最先的;首（次）的;（用于工作或职位的头衔中）最高的;最重要的;（一列中）最前面的;最迫切的，最合适的;（某一时间或某事后的）紧接着来到的
adv.第一，最初;（列举时用）首先;第一次;起初;（强调不愿意）宁可;以身体的某一部位（或某人）在先（或为首）
n.第一个人(或事物);一等品;(汽车、自行车等的)一挡，最低挡;（棒球）第一垒;前所未有的事情;（英国大学学位）最高成绩
pron.第一次

复数： firsts

first

牛津词典

ordinal number

第一
happening or coming before all other similar things or people; 1st

his first wife

他的第一个妻子

It was the first time they had ever met.

这是他们初次见面。

I didn't take the first bus.

我没有乘坐首班公共汽车。

students in their first year at college

大学一年级学生

your first impressions

你的初步印象

She resolved to do it at the first (= earliest) opportunity.

她决定一有机会就去做。

King Edward I (= said as ‘King Edward the First’)

英王爱德华一世

the first of May/May 1st

5月1日

His second book is better than his first.

他的第二部书比第一部好。

最重要的；首要的；最优秀的
the most important or best

Your first duty is to your family.

你首要的是对家庭尽责。

She won first prize in the competition.

她在竞赛中获得头奖。

an issue of the first importance

最重要的问题

习语

saying humorous

the fact that sth has not happened before does not mean that it will never happen

of a high quality or degree; of the highest quality or greatest degree

这项工作要求高超的外交技巧。
The job requires diplomatic skills of a high order.

She was a snob of the first order.

她是天字第一号势利鬼。

adv.

首先；第一；最初
before anyone or anything else; at the beginning

‘Do you want a drink?’ ‘I'll finish my work first.’

“你想喝杯饮料吗？”“我要先完成工作。”

First I had to decide what to wear.

首先我得决定穿什么。

Who came first in the race (= who won) ?

赛跑谁第一？

It plunged nose first into the river.

它一头跳入水中。

第一次；首次
for the first time

When did you first meet him?

你和他初次见面是何时？

（列举时用）第一，首先
used to introduce the first of a list of points you want to make in a speech or piece of writing

This method has two advantages: first it is cheaper and second it is quicker.

这个方法有两个优点：一是更便宜，二是较快。

（强调不愿意）宁可，宁愿
used to emphasize that you are determined not to do sth

She swore that she wouldn't apologize─she'd die first!

她发誓决不道歉——宁死也不！

习语

at or in the beginning

起初我并不很喜欢这个工作。
I didn't like the job much at first.

At first I thought he was shy, but then I discovered he was just not interested in other people.

起先我以为他腼腆，后来才发现他对别人没兴趣。

If at first you don't succeed, try, try again.

一次不成功就反复尝试。

to be considered more important than anything else

她作任何决定都是家庭第一。
In any decision she makes, her family always comes first.

more than anything else

他干一点教学，但首要的是写作。
He does a little teaching, but first and foremost he's a writer.

in every way that is important; completely

她认为她自己是一个不折不扣的音乐家。
She regarded herself, first and last, as a musician.

saying

people will be dealt with, seen, etc. strictly in the order in which they arrive

票先来先买，售完为止。
Tickets are available on a first come, first served basis.

informal especially BrE

before anything else

首先咱们看看这要花多少钱。
First off, let's see how much it'll cost.

BrE informal

to start with; before anything else

to consider sb/sth to be more important than anyone/anything else

她总是把子女放在第一位。
She always puts her children first.

saying

safety is the most important thing

noun

第一个人（或事物）
the first person or thing mentioned; the first person or thing to do a particular thing

I was the first in my family to go to college.

我是我们家第一个大学生。

Sheila and Jim were the first to arrive.

希拉和吉姆最先到的。

I'd be the first to admit (= I will most willingly admit) I might be wrong.

我非常愿意承认我可能错了。

The first I heard about the wedding (= the first time I became aware of it) was when I saw it in the local paper.

我最初知道他们结婚的消息是从当地报纸上看到的。

空前的成就；前所未有的事情
an achievement, event, etc., never done or experienced before

We went on a cruise, a first for both of us.

我俩都是平生第一次去海上旅游。

（汽车、自行车等的）一挡，最低挡
the lowest gear on a car, bicycle, etc. that you use when you are moving slowly

He stuck the car in first and revved.

他挂上了一挡，开动了汽车。

（英国大学学位）最高成绩，优等成绩
the highest level of university degree at British universities

She got a first in maths at Exeter.

她在埃克塞特大学毕业，获数学一级优等学位。

习语

the person or thing with the highest status in a group

from the beginning

他俩一见倾心。
They were attracted to each other from the first.

from beginning to end; during the whole time

这是个精彩的演出，自始至终都扣人心弦。
It's a fine performance that commands attention from first to last.

柯林斯词典

first

频次

1
ORD 最早的;最先的;第一位的
The first thing, person, event, or period of time is the one that happens or comes before all the others of the same kind.

She lost 16 pounds in the first month of her diet.

她节食的头一个月就减掉了16磅。
2
ADV 最早;最先;先
If you do something first, you do it before anyone else does, or before you do anything else.

I do not remember who spoke first, but we all expressed the same opinion...

我不记得是谁最先发言的，但我们全都表达了相同的看法。
3
ORD 第一(次)的;首(次)的
When something happens or is done for the first time, it has never happened or been done before.

This is the first time she has experienced disappointment...

这是她第一次感受到失望。
4
N-SING 首次出现的事物;首例
An event that is described as a first has never happened before and is important or exciting.

It is a first for New York. An outdoor exhibition of Fernando Botero's sculpture on Park Avenue.

在公园大道上露天展出费尔南多·博特罗的雕塑，这在纽约还是破天荒的事。
5
PRON 第一次;首次
The first you hear of something or the first you know about it is the time when you first become aware of it.

We heard it on the TV last night — that was the first we heard of it...

昨晚我们在电视上听到了这件事——那是我们头回听说。
6
ADV 最初;起初;开始
You use first when you are talking about what happens in the early part of an event or experience, in contrast to what happens later.

When he first came home he wouldn't say anything about what he'd been doing.

刚回到家时，他只字不提自己一直在做什么。
7
ADV (强调不愿意做某事)宁可，宁愿
In order to emphasize your determination not to do a particular thing, you can say that rather than do it, you would do something else first .

Marry that fat son of a fat cattle dealer? She would die first!

嫁给那个大腹便便的牛贩子的胖儿子？她宁愿去死！
8
ADV (用于列举条目)第一，首先
You use first when you are about to give the first in a series of items.

Certain guidelines can be given. First, have a heating engineer check the safety of the system.

可以提供一些指导原则：第一，找位供暖工程师检查系统的安全性。
9
ORD (一列中)离得最近的，最前面的
The first thing, person, or place in a line is the one that is nearest to you or nearest to the front.

Before him, in the first row, sat the President...

在他面前第一排坐着总统。
10
ORD 首要的;头等的
You use first to refer to the best or most important thing or person of a particular kind.

The first duty of any government must be to protect the interests of the taxpayers...

任何政府的首要职责都必须是保护纳税人的利益。
11
ORD (用于工作或职位的头衔中)最高的
First is used in the title of the job or position of someone who has a higher rank than anyone else with the same basic job title.

...the First Lord of the Admiralty.

海军大臣
12
N-COUNT (英国大学的)优等学位，一级荣誉学位
In British universities, a first is an honours degree of the highest standard.

...an Oxford Blue who took a First in Constitutional History.

获得宪法史优等学位的牛津大学校队运动员
13
PHRASE 第一;首先
You use first of all to introduce the first of a number of things that you want to say.

The cut in the interest rates has not had very much impact in California for two reasons. First of all, banks are still afraid to loan.

降息在加利福尼亚并未产生多大影响，原因有二。首先，银行仍然不敢放贷。
14
PHRASE 最初;起初;开始时
You use at first when you are talking about what happens in the early stages of an event or experience, or just after something else has happened, in contrast to what happens later.

At first, he seemed surprised by my questions...

起初，他似乎对我的问题感到惊讶。
15
PHRASE 居于首要地位;占据头等位置
If you say that someone or something comes first for a particular person, you mean they treat or consider that person or thing as more important than anything else.

There's no time for boyfriends, my career comes first.

我没时间交男朋友，事业对我来说是第一位的。
16
PHRASE 先到先接待;先到先供应;按先来后到对待
You say 'first come first served' to indicate that a group of people or things will be dealt with or given something in the order in which they arrive.

There will be five buses, first come first served.

会有5辆巴士，先到先上。
17
PHRASE 从最初;从一开始
From the first means ever since something started.

You knew about me from the first, didn't you?...

从一开始你就知道我，对吧？
18
PHRASE 第一手地;直接;亲自
If you learn or experience something at first hand, you experience it yourself or learn it directly rather than being told about it by other people.

He arrived in Natal to see at first hand the effects of the recent heavy fighting.

他来到纳塔尔亲自了解最近发生的激烈冲突造成的后果。
19
PHRASE 对…一无所知;对…毫不知晓
If you say that you do not know the first thing about something, you are emphasizing that you know absolutely nothing about it.

You don't know the first thing about farming.

你对种地一窍不通。
20
PHRASE 第一;首先
You use first off to introduce the first of a number of things that you want to say.

First off, huge apologies for last month's confusing report.

首先，要对上个月那篇交代不清的报道表示深深的歉意。
21
PHRASE 视…为最重要;把…放在首位
If you put someone or something first, you treat or consider them as more important than anything else.

Somebody has to think for the child and put him first.

必须有人替孩子着想，把他放在第一位。
22
PHRASE 最重要的先做;最要紧的先处理
You say 'first things first' when you are talking about something that should be done or dealt with before anything else because it is the most important.

Let's see if we can't find something to set the mood. First things first; some music.

看看我们能不能找点什么烘托一下气氛。当务之急：来点音乐吧。
23
first and foremost→ see:foremost

英英释义

noun

the fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate): Synonym: first base

the lowest forward gear ratio in the gear box of a motor vehicle;used to start a car moving: Synonym: first gear low gear low

an honours degree of the highest class: Synonym: first-class honours degree

the first element in a countable series: the first of the month; Synonym: number one number 1

the first or highest in an ordering or series: He wanted to be the first; Synonym: number one

the time at which something is supposed to begin: they got an early start; she knew from the get-go that he was the man for her; Synonym: beginning commencement outset get-go start kickoff starting time showtime offset

adj

ranking above all others: was first in her class; the foremost figure among marine artists; the top graduate; Synonym: foremost world-class

serving to begin: the beginning canto of the poem; the first verse; Synonym: beginning(a)

serving to set in motion: the magazine's inaugural issue; the initiative phase in the negotiations; an initiatory step toward a treaty; his first (or maiden) speech in Congress; the liner's maiden voyage; Synonym: inaugural initiative initiatory maiden

preceding all others in time or space or degree: the first house on the right; the first day of spring; his first political race; her first baby; the first time; the first meetings of the new party; the first phase of his training

highest in pitch or chief among parts or voices or instruments or orchestra sections: first soprano; the first violin section; played first horn

indicating the beginning unit in a series: Synonym: 1st

adv

before anything else: first we must consider the garter snake; Synonym: firstly foremost first of all first off

the initial time: when Felix first saw a garter snake; Synonym: for the first time

prominently forward: he put his best foot foremost; Synonym: foremost

before another in time, space, or importance: I was here first; let's do this job first

数据来源：WordNet

双语例句

1

The first stage in research is data collection .

研究工作的第一步是收集资料。
2

Take the first right , then the second left .

在第一个路口向右拐，然后再在第二个路口向左拐。
3

Let 's be practical and work out the cost first .

咱们实际一点儿，先计算一下成本费用。
4

Our first task is to set up a communications system .

我们的首项任务是架设通信系统。
5

Our first task will be to set up a communications system .

我们的首项任务是架设通信系统。
6

You go first , I 'll take my lead from you .

你领头，我来照样做。
7

I think we should go back to first principles .

我认为我们应该回到基本原则上。
8

First of all we must identify the problem areas .

首先我们必须找出问题所在。
9

The book wasn 't anything like as good as her first one .

这本书远远不如她的处女作。
10

First get students to form groups of four .

首先让学生分成四人一组。
11

His first music teacher was a major influence in his life .

他的第一位音乐老师是他一生中对他影响非常大的人。
12

The school is the first of its kind in Britain .

这是英国同类学校中最早的一所。
13

Mark has two children to support from his first marriage .

马克得扶养他第一次婚姻生的两个孩子。
14

He didn 't make it past first base .

他未能跑过一垒。
15

I don 't remember my first day at school .

我已经忘了第一天上学的情景。
16

It 's not fair ─ I never get to go first .

这不公平——我从来没有机会先走。
17

Does he know to come here first ?

他知道要先到这儿来吗？
18

You need to take the top off the bottle first !

你得先把瓶盖子打开！
19

His second book is better than his first .

他的第二部书比第一部好。
20

Do you want the good news or the bad news first ?

你是想先听好消息还是坏消息？
21

I like most sports but tennis is my first love .

大多数运动我都喜欢，而网球是我的第一爱好。
22

I should never have taken that job in the first place .

我当初就不该接受那份工作。
23

The first 24 hours after the operation are the most critical .

病人手术后头24小时是最危险的。
24

First try to do something that is within your scope .

你先试着做一件自己力所能及的事。
25

In any decision she makes , her family always comes first .

她作任何决定都是家庭第一。
26

With the first goal he used his head in more ways than one .

他进第一个球时从多方面动了脑筋。
27

The situation was more complicated than they had at first realized .

形势比他们最初意识到的更为复杂。
28

She achieved some measure of success with her first book .

她出第一部书就得到了相当的成功。
29

I spent most time on the first question .

我在第一个问题上花的时间最多。
30

The first year provides students with a sound theoretical basis for later study .

第一年为学生以后的学习奠定坚实的理论基础。

词语用例

习语

ordinal number

there's a first time for everything

(saying humorous)没有发生的事情并不意味着永远不会发生；什么事情都有第一次
the fact that sth has not happened before does not mean that it will never happen

of a high order of the highest/first order

高质量的；高品质的；一流的
of a high quality or degree; of the highest quality or greatest degree

The job requires diplomatic skills of a high order.

这项工作要求高超的外交技巧。

She was a snob of the first order.

她是天字第一号势利鬼。

adv.

at first

起初；起先
at or in the beginning

I didn't like the job much at first.

起初我并不很喜欢这个工作。

At first I thought he was shy, but then I discovered he was just not interested in other people.

起先我以为他腼腆，后来才发现他对别人没兴趣。

If at first you don't succeed, try, try again.

一次不成功就反复尝试。

come first

首要；第一；首先要考虑的
to be considered more important than anything else

In any decision she makes, her family always comes first.

她作任何决定都是家庭第一。

first and foremost

首要的是；首先
more than anything else

He does a little teaching, but first and foremost he's a writer.

他干一点教学，但首要的是写作。

first and last

从各方面看；完全地
in every way that is important; completely

She regarded herself, first and last, as a musician.

她认为她自己是一个不折不扣的音乐家。

first come, first served

(saying)先来先接待；先到先供应；按先来后到对待
people will be dealt with, seen, etc. strictly in the order in which they arrive

Tickets are available on a first come, first served basis.

票先来先买，售完为止。

first of all

第一；首先
before doing anything else; at the beginning

First of all, let me ask you something.

首先，让我问你一件事。

最重要；首先
as the most important thing

The content of any article needs, first of all, to be relevant to the reader.

任何文章的内容都首先要与读者有关。

first off

(informal especially BrE)首先
before anything else

First off, let's see how much it'll cost.

首先咱们看看这要花多少钱。

first up

(BrE informal)第一；首先
to start with; before anything else

put sb/sth first

认为…最重要；把…放在第一位
to consider sb/sth to be more important than anyone/anything else

She always puts her children first.

她总是把子女放在第一位。

feet first

脚先着地
with your feet touching the ground before any other part of your body

He landed feet first.

他落地时双脚先着地。

伸腿离开某地（指死去）
if you leave a place feet first , you are carried out after you are dead

You'll have to carry me out feet first!

想把我撵走，除非让我横着出去！

head first

头在前；头朝下
moving forwards or downwards with your head in front of the rest of your body

He fell head first down the stairs.

他倒栽葱摔下楼梯。

未经深思；轻率；鲁莽
without thinking carefully about sth before acting

She got divorced and rushed head first into another marriage.

她离婚后又仓促再婚了。

safety first

(saying)安全第一
safety is the most important thing

first among equals

第一把手；首要的事物
the person or thing with the highest status in a group

from the (very) first

从一开始
from the beginning

They were attracted to each other from the first.

他俩一见倾心。

from first to last

从头至尾；自始至终
from beginning to end; during the whole time

It's a fine performance that commands attention from first to last.

这是个精彩的演出，自始至终都扣人心弦。

同反义词

同义词

adv.

foremost initially

first

牛津词典

柯林斯词典

first

1
ORD 最早的;最先的;第一位的
The first thing, person, event, or period of time is the one that happens or comes before all the others of the same kind.

2
ADV 最早;最先;先
If you do something first, you do it before anyone else does, or before you do anything else.

3
ORD 第一(次)的;首(次)的
When something happens or is done for the first time, it has never happened or been done before.

4
N-SING 首次出现的事物;首例
An event that is described as a first has never happened before and is important or exciting.

5
PRON 第一次;首次
The first you hear of something or the first you know about it is the time when you first become aware of it.

6
ADV 最初;起初;开始
You use first when you are talking about what happens in the early part of an event or experience, in contrast to what happens later.

7
ADV (强调不愿意做某事)宁可，宁愿
In order to emphasize your determination not to do a particular thing, you can say that rather than do it, you would do something else first .

8
ADV (用于列举条目)第一，首先
You use first when you are about to give the first in a series of items.

9
ORD (一列中)离得最近的，最前面的
The first thing, person, or place in a line is the one that is nearest to you or nearest to the front.

10
ORD 首要的;头等的
You use first to refer to the best or most important thing or person of a particular kind.

11
ORD (用于工作或职位的头衔中)最高的
First is used in the title of the job or position of someone who has a higher rank than anyone else with the same basic job title.

12
N-COUNT (英国大学的)优等学位，一级荣誉学位
In British universities, a first is an honours degree of the highest standard.

13
PHRASE 第一;首先
You use first of all to introduce the first of a number of things that you want to say.

14
PHRASE 最初;起初;开始时
You use at first when you are talking about what happens in the early stages of an event or experience, or just after something else has happened, in contrast to what happens later.

15
PHRASE 居于首要地位;占据头等位置
If you say that someone or something comes first for a particular person, you mean they treat or consider that person or thing as more important than anything else.

16
PHRASE 先到先接待;先到先供应;按先来后到对待
You say 'first come first served' to indicate that a group of people or things will be dealt with or given something in the order in which they arrive.

17
PHRASE 从最初;从一开始
From the first means ever since something started.

18
PHRASE 第一手地;直接;亲自
If you learn or experience something at first hand, you experience it yourself or learn it directly rather than being told about it by other people.

19
PHRASE 对…一无所知;对…毫不知晓
If you say that you do not know the first thing about something, you are emphasizing that you know absolutely nothing about it.

20
PHRASE 第一;首先
You use first off to introduce the first of a number of things that you want to say.

21
PHRASE 视…为最重要;把…放在首位
If you put someone or something first, you treat or consider them as more important than anything else.

22
PHRASE 最重要的先做;最要紧的先处理
You say 'first things first' when you are talking about something that should be done or dealt with before anything else because it is the most important.

23
first and foremost→ see:foremost

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first

牛津词典

柯林斯词典

first

1 ORD 最早的;最先的;第一位的 The first thing, person, event, or period of time is the one that happens or comes before all the others of the same kind.

2 ADV 最早;最先;先 If you do something first, you do it before anyone else does, or before you do anything else.

3 ORD 第一(次)的;首(次)的 When something happens or is done for the first time, it has never happened or been done before.

4 N-SING 首次出现的事物;首例 An event that is described as a first has never happened before and is important or exciting.

5 PRON 第一次;首次 The first you hear of something or the first you know about it is the time when you first become aware of it.

6 ADV 最初;起初;开始 You use first when you are talking about what happens in the early part of an event or experience, in contrast to what happens later.

7 ADV (强调不愿意做某事)宁可，宁愿 In order to emphasize your determination not to do a particular thing, you can say that rather than do it, you would do something else first .

8 ADV (用于列举条目)第一，首先 You use first when you are about to give the first in a series of items.

9 ORD (一列中)离得最近的，最前面的 The first thing, person, or place in a line is the one that is nearest to you or nearest to the front.

10 ORD 首要的;头等的 You use first to refer to the best or most important thing or person of a particular kind.

11 ORD (用于工作或职位的头衔中)最高的 First is used in the title of the job or position of someone who has a higher rank than anyone else with the same basic job title.

12 N-COUNT (英国大学的)优等学位，一级荣誉学位 In British universities, a first is an honours degree of the highest standard.

13 PHRASE 第一;首先 You use first of all to introduce the first of a number of things that you want to say.

14 PHRASE 最初;起初;开始时 You use at first when you are talking about what happens in the early stages of an event or experience, or just after something else has happened, in contrast to what happens later.

15 PHRASE 居于首要地位;占据头等位置 If you say that someone or something comes first for a particular person, you mean they treat or consider that person or thing as more important than anything else.

16 PHRASE 先到先接待;先到先供应;按先来后到对待 You say 'first come first served' to indicate that a group of people or things will be dealt with or given something in the order in which they arrive.

17 PHRASE 从最初;从一开始 From the first means ever since something started.

18 PHRASE 第一手地;直接;亲自 If you learn or experience something at first hand, you experience it yourself or learn it directly rather than being told about it by other people.

19 PHRASE 对…一无所知;对…毫不知晓 If you say that you do not know the first thing about something, you are emphasizing that you know absolutely nothing about it.

20 PHRASE 第一;首先 You use first off to introduce the first of a number of things that you want to say.

21 PHRASE 视…为最重要;把…放在首位 If you put someone or something first, you treat or consider them as more important than anything else.

22 PHRASE 最重要的先做;最要紧的先处理 You say 'first things first' when you are talking about something that should be done or dealt with before anything else because it is the most important.

23 first and foremost→ see:foremost

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1
ORD 最早的;最先的;第一位的
The first thing, person, event, or period of time is the one that happens or comes before all the others of the same kind.

2
ADV 最早;最先;先
If you do something first, you do it before anyone else does, or before you do anything else.

3
ORD 第一(次)的;首(次)的
When something happens or is done for the first time, it has never happened or been done before.

4
N-SING 首次出现的事物;首例
An event that is described as a first has never happened before and is important or exciting.

5
PRON 第一次;首次
The first you hear of something or the first you know about it is the time when you first become aware of it.

6
ADV 最初;起初;开始
You use first when you are talking about what happens in the early part of an event or experience, in contrast to what happens later.

7
ADV (强调不愿意做某事)宁可，宁愿
In order to emphasize your determination not to do a particular thing, you can say that rather than do it, you would do something else first .

8
ADV (用于列举条目)第一，首先
You use first when you are about to give the first in a series of items.

9
ORD (一列中)离得最近的，最前面的
The first thing, person, or place in a line is the one that is nearest to you or nearest to the front.

10
ORD 首要的;头等的
You use first to refer to the best or most important thing or person of a particular kind.

11
ORD (用于工作或职位的头衔中)最高的
First is used in the title of the job or position of someone who has a higher rank than anyone else with the same basic job title.

12
N-COUNT (英国大学的)优等学位，一级荣誉学位
In British universities, a first is an honours degree of the highest standard.

13
PHRASE 第一;首先
You use first of all to introduce the first of a number of things that you want to say.

14
PHRASE 最初;起初;开始时
You use at first when you are talking about what happens in the early stages of an event or experience, or just after something else has happened, in contrast to what happens later.

15
PHRASE 居于首要地位;占据头等位置
If you say that someone or something comes first for a particular person, you mean they treat or consider that person or thing as more important than anything else.

16
PHRASE 先到先接待;先到先供应;按先来后到对待
You say 'first come first served' to indicate that a group of people or things will be dealt with or given something in the order in which they arrive.

17
PHRASE 从最初;从一开始
From the first means ever since something started.

18
PHRASE 第一手地;直接;亲自
If you learn or experience something at first hand, you experience it yourself or learn it directly rather than being told about it by other people.

19
PHRASE 对…一无所知;对…毫不知晓
If you say that you do not know the first thing about something, you are emphasizing that you know absolutely nothing about it.

20
PHRASE 第一;首先
You use first off to introduce the first of a number of things that you want to say.

21
PHRASE 视…为最重要;把…放在首位
If you put someone or something first, you treat or consider them as more important than anything else.

22
PHRASE 最重要的先做;最要紧的先处理
You say 'first things first' when you are talking about something that should be done or dealt with before anything else because it is the most important.

23
first and foremost→ see:foremost