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Verb slacken has 4 senses
slow, slow down, slow up, slack, slacken - become slow or slower; "Production slowed"--1 is one way to weaken
 Sample sentences:
 Something ----s
 Somebody ----s
 
slack, slacken, slack up, relax - make less active or fast; "He slackened his pace as he got tired"; "Don't relax your efforts now"--2 is one way to decrease, lessen, minify
 Sample sentences:
 Somebody ----s something
 Something ----s something
 
slacken - become looser or slack; "the rope slackened"--3 is one way to weaken
 Sample sentence:
 Something ----s
 
 slacken, remit - make slack as by lessening tension or firmness--4 is one way to loosen, loose
 Sample sentences:
 Somebody ----s something
 Something ----s something
 
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