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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
  • She stood at the foot of the bed and reached back to unfasten her hair.
  • If you can unfasten your sound system and take it with you, or lock it in your trunk, do so.
  • unfasten waist belts and loosen shoulder straps of packs when crossing.
  • One last time she tried to unfasten the seat belt on her own, holding her breath.
  • He started to unfasten the boat-hook that was attached to the side of the wheelhouse.
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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