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[uhn-fas-uh n, -fah-suh n] /ʌnˈfæs ən, -ˈfɑ sən/
verb (used with object)
to release from or as from fastenings; detach.
to undo or open (something fastened).
verb (used without object)
to become unfastened.
Origin of unfasten
1175-1225; Middle English unfastnen. See un-2, fasten Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unfasten
Contemporary Examples
Historical Examples
  • His hands were feeble and numb, but he contrived to unfasten the strap.

    His Unknown Wife Louis Tracy
  • “Get rid of the skirts,” said Nancy, struggling to unfasten her own.

    A Little Miss Nobody Amy Bell Marlowe
  • "No, not Champe—Dan," said Betty, stooping to unfasten her boots.

    The Battle Ground Ellen Glasgow
  • With a calm smile, he helped them to remove his coat and to unfasten his cuffs.

    The Regent's Daughter Alexandre Dumas (Pere)
  • Laddie knelt down and began to unfasten the strap of the one good skate, which was still on Rose's left foot.

  • Could he unfasten and mount one before any of them a wakened?

    The Young Adventurer Horatio Alger
  • In addition to this Haley tied his wrists together, fearing that otherwise he might be able to unfasten the knot.

    Brave and Bold Horatio Alger
  • He left his spade sticking in the earth, and went to unfasten the gate.

    Antony Gray,--Gardener Leslie Moore
  • Yea, though every knight in the realm essayed to unfasten that cincture, it would not yield, except to one alone.

British Dictionary definitions for unfasten


to undo, untie, or open or become undone, untied, or opened
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unfasten

early 13c., from un- (2) + fasten. Related: Unfastened; unfastening.

Online Etymology Dictionary, © 2010 Douglas Harper
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