2 make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now" [syn: slack, slack up, relax]
3 become looser or slack; "the rope slackened"
4 make slack as by lessening tension or firmness [syn: remit]
- From Old English: slǣcan
(intransitive) to gradually decrease in intensity
(transitive) to gradually decrease in intensity
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