slack water

Noun
  1. A stretch of water without current or movement (synset 109459810)
    "suddenly they were in a slack and the water was motionless"
    is a type of: stretch - a large and unbroken expanse or distance
    same as: slack
  2. The occurrence of relatively still water at the turn of the (low) tide (synset 107418379)
    is a type of: tide - the periodic rise and fall of the sea level under the gravitational pull of the moon
    same as: slack tide

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