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slack water

美 [slæk ˈwɔːtər]英 [slæk ˈwɔːtə(r)]

slack water

noun

the occurrence of relatively still water at the turn of the (low) tide: Synonym: slack tide

a stretch of water without current or movement: suddenly they were in a slack and the water was motionless; Synonym: slack

数据来源：WordNet

1

Each time the current changes directions , a period of no current , known as slack water , intervenes .

每当潮流改变方向时，中间都有一段叫做平潮的无潮流阶段。
2

From just the entrance , in the southern part of the bay , up to a second slack water area , about midway up the bay , tidal currents are ebbing .

在海湾的南部，从紧靠入口处内侧直到第二平潮区，其间距离大约是到海湾的一半，潮流正在回落。