[uhn-fas-uhn, -fah-suhn]
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.

1175–1225; Middle English unfastnen. See un-2, fasten

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unfasten (ʌnˈfɑːsən)
to undo, untie, or open or become undone, untied, or opened

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., from un- (2) + fasten.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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.
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