I. ˈ ̷ ̷| ̷ ̷ ̷ ̷ adjective
Etymology: slack water
1. : marked by slack water
a slack-water period
2. : carried on in slack water produced artificially (as by a lock or dam)
slack-water navigation
II. transitive verb
: to produce slack water in (as a river) by a construction (as a dam, lock, or jetty)