| slack | (verb) release tension on | - |
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| (verb) make less active or fast | Synonyms: relax, slack up, slacken |
| (verb) make less active or intense | Synonyms: abate, slake |
| (verb) become slow or slower | Synonyms: slacken, slow, slow down, slow up |
| (verb) cause to heat and crumble by treatment with water | Synonyms: slake |
| (verb) become less in amount or intensity | Synonyms: abate, die away, let up, slack off |
| (verb) be inattentive to, or neglect | - |
| (verb) avoid responsibilities and work, be idle | - |
| slacken | (verb) become looser or slack | - |
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| (verb) make slack as by lessening tension or firmness | Synonyms: remit |
| (verb) become slow or slower | Synonyms: slack, slow, slow down, slow up |
| (verb) make less active or fast | Synonyms: relax, slack, slack up |