Verb slacken has 4 senses
  1. 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
  2. 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
  3. slacken - become looser or slack; "the rope slackened"
    --3 is one way to
    weaken
    Sample sentence:
    Something ----s
  4. slacken, remit - make slack as by lessening tension or firmness
    --4 is one way to loosen, loose
    Derived form: noun slackening1
    Sample sentences:
    Somebody ----s something
    Something ----s something
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