1. (verb) slow, slow down, slow up, slack, slacken
become slow or slower
Synonyms: decompress, slow down, unbend, slacken, remit, let up, slack off, abate, loosen up, slow, decelerate, slack up, retard, slake, relax, slack, die away, unwind, slow up
2. (verb) slack, slacken, slack up, relax
make less active or fast
Synonyms: unstrain, decompress, slow down, unbend, slacken, loosen, remit, let up, unlax, slack off, abate, loosen up, slow, loose, slack up, slake, relax, slack, die away, unwind, make relaxed, slow up
3. (verb) slacken
become looser or slack
Synonyms: slow down, relax, slow up, slack, remit, slow, slack up
4. (verb) slacken, remit
make slack as by lessening tension or firmness
Synonyms: defer, shelve, slow down, send back, set back, hold over, remit, slacken, table, remand, put over, slow, slack up, prorogue, relax, slack, put off, slow up, postpone
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Synonyms for slacken 
