slack-water
Noun
Meaning
a stretch of water without current or movement
the occurrence of relatively still water at the turn of the (low) tide
Source: WordNetAlternative names
slack water
Synonyms
Hypernyms
Examples
suddenly they were in a slack and the water was motionless
Ice sheets typically form along the shoreline and in slack water bays, where the lake is not as deep.
The moment that the tidal current ceases is called slack water or slack tide.