unfasten - definition and synonyms

verb [transitive] 

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/ʌnˈfɑːs(ə)n/
present tense
I/you/we/theyunfasten
he/she/itunfastens
present participleunfastening
past tenseunfastened
past participleunfastened
  1. to move the part that holds something together, especially on a piece of clothing or a belt

    Unfasten your top button.

    It is now safe to unfasten your seatbelts.