un ‧ fas ‧ ten /ʌnˈfɑːs ə n $ -ˈfæs ə n/ BrE AmE verb [transitive]
[ Word Family: verb : ↑ fasten ≠ ↑ unfasten ; noun : ↑ fastener ]
to undo something such as a button, belt, rope etc:
He unfastened the top button of his shirt.
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THESAURUS
▪ unfasten to open the two sides of a piece of clothing, bag, belt etc:
It was hot in the waiting-room, so I unfastened my coat.
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Please do not unfasten your seatbelt while the vehicle is in motion.
▪ undo to unfasten clothes or unfasten buttons, zips etc on clothes:
My fingers were so cold that I couldn’t undo the buttons.
▪ untie to unfasten the knot that fastens shoes, a tie, a scarf etc:
He untied his shoes and kicked them off.
▪ unbutton to unfasten the buttons on a piece of clothing:
She slowly unbuttoned her blouse.
▪ unzip to unfasten clothes, bags etc by unfastening a zip:
She unzipped the case and took out a thick file.
▪ loosen to unfasten clothes a little, but not completely, in order to make yourself more comfortable:
Carter took off his jacket and loosened his tie.
▪ open to unfasten a bag, box, or other container:
‘Could you open your bag, please?’ said the security guard.