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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
  • Then with her slender fingers she tried to unfasten the knots that secured the cord.

    Henry Dunbar M. E. Braddon
  • "No, not Champe—Dan," said Betty, stooping to unfasten her boots.

    The Battle Ground Ellen Glasgow
  • Jeter frantically tried to unfasten the handcuffs as they ran.

    Lords of the Stratosphere Arthur J. Burks
  • Laddie knelt down and began to unfasten the strap of the one good skate, which was still on Rose's left foot.

  • I'll sit on his head, son, while you see how many pieces you can unfasten in his harness.

    Mixed Faces Roy Norton
  • 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
  • I'll unfasten it for you just as soon as you are ready to start.

    Dave Porter At Bear Camp Edward Stratemeyer
  • 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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