Synonyms for loosen
verb
To make loose
extricate, release, unfix; see free 1.
To become loose
relax, slacken, work loose, work free, go slack, break up, let go, become unfastened, become undone, become unstuck*.
Antonyms tighten*, tighten up, become rigid.
See loosen in Webster's New World Roget's A-Z Thesaurus II
verb
To free from ties or fasteners:
disengage, loose, slip, unbind, unclasp, undo, unfasten, unloose, unloosen, untie. See tightenTo reduce in tension, pressure, or rigidity:
ease, let up, loose, relax, slack, slacken, untighten. See tighten
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