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tr. & intr.v. slack·ened, slack·en·ing, slack·ens
1. To make or become slower; slow down: The runners slackened their pace. Air speed slackened.
2. To make or become less tense, taut, or firm; loosen: I slackened the line to let the fish swim. The sail's sheet slackened as the wind died.
3. To make or become less vigorous, intense, or severe; ease: slacken discipline; afraid that morale might slacken.
an act of becoming looseran act of becoming less intense, slower, etc
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|Noun||1.||slackening - an occurrence of control or strength weakening; "the relaxation of requirements"; "the loosening of his grip"; "the slackening of the wind"|
weakening - becoming weaker
thaw - a relaxation or slackening of tensions or reserve; becoming less hostile; "the thaw between the United States and Russia has led to increased cooperation in world affairs"