slack water

Definitions of slack water
  1. noun
    the occurrence of relatively still water at the turn of the (low) tide
    synonyms: slack tide
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    type of:
    the periodic rise and fall of the sea level under the gravitational pull of the moon
  2. noun
    a stretch of water without current or movement
    synonyms: slack
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    type of:
    a large and unbroken expanse or distance
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