Definition of unfasten verb from the Oxford Advanced Learner's Dictionary

 

unfasten

 verb
verb
BrE BrE//ʌnˈfɑːsn//
 
; NAmE NAmE//ʌnˈfæsn//
 
Verb Forms present simple I / you / we / they unfasten
BrE BrE//ʌnˈfɑːsn//
 
; NAmE NAmE//ʌnˈfæsn//
 
he / she / it unfastens
BrE BrE//ʌnˈfɑːsnz//
 
; NAmE NAmE//ʌnˈfæsnz//
 
past simple unfastened
BrE BrE//ʌnˈfɑːsnd//
 
; NAmE NAmE//ʌnˈfæsnd//
 
past participle unfastened
BrE BrE//ʌnˈfɑːsnd//
 
; NAmE NAmE//ʌnˈfæsnd//
 
-ing form unfastening
BrE BrE//ʌnˈfɑːsnɪŋ//
 
; NAmE NAmE//ʌnˈfæsnɪŋ//
 
 
jump to other results
unfasten something to undo something that is fastened to unfasten a belt/button, etc. Passengers are permitted to unfasten their seat belts. opposite fasten
See the Oxford Advanced American Dictionary entry: unfasten