American English

Definition of unfasten verb from the Oxford Advanced American Dictionary

 

unfasten

 verb
verb
NAmE//ʌnˈfæsn//
 
unfasten somethingVerb Forms present simple I / you / we / they unfasten
 
he / she / it unfastens
 
past simple unfastened
 
-ing form unfastening
 
 
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to undo something that is fastened to unfasten a belt/button, etc. opposite fasten
See the Oxford Advanced Learner's Dictionary entry: unfasten