Definition of unfasten in English:

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Pronunciation: /ʌnˈfɑːs(ə)n/


[with object]
1Open the fastening of; undo (something): Allie stands before the mirror unfastening her earrings
More example sentences
  • I heard the door lock being unfastened and the door opened.
  • Vincent ignored her, unfastening his seatbelt and opening his door.
  • He closed the door again and unfastened the chains, opening the door again, all the way this time.
1.1 [no object] Become loose or undone: the dress unfastened easily
More example sentences
  • If the patch unfastens, it becomes a loose body in the knee and requires surgical removal.
  • Because the fabric's material fastens and unfastens so easily, Ray can move the bands any time they look like they need repositioning.
  • The band unfastened with a snap and a pop, then blood flowed back into her arm.
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