UNFASTEN
Meaning of UNFASTEN in English
/ ʌnˈfɑːsn; NAmE ʌnˈfæsn/ verb
[ vn ] to undo sth that is fastened :
to unfasten a belt / button, etc.
OPP fasten
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005