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OET→unfasten

unfasten

Flag: gbEnglishOxford English Thesaurus
unfasten
verb
Ron unfastened his seat belt:
undo, open, detach, disconnect, remove, untie, unbutton, unzip, loose, loosen, free, separate, disengage, disjoin, uncouple, unwrap, unbind, unhook, unclick, unlace, unhitch, untether, unlock, unbolt.
▷antonyms fasten, do something up, lock.
unfasten Oxford Dictionary of English