Definition of “unfasten” - English Dictionary

american-english dictionary

(Definition of “unfasten” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“unfasten” in American English

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unfastenverb [ I/T ]

us /ʌnˈfæs·ən/

to make looser or take apart something that fastens or is fastened:

[ T ] Cal loosened his tie and unfastened his collar.

(Definition of “unfasten” from the Cambridge Academic Content Dictionary © Cambridge University Press)