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unfasten

[uhn-fas-uh n, -fah-suh n] /ʌnˈfæs ən, -ˈfɑ sən/
verb (used with object)
1.
to release from or as from fastenings; detach.
2.
to undo or open (something fastened).
verb (used without object)
3.
to become unfastened.
Origin
1175-1225
1175-1225; Middle English unfastnen. See un-2, fasten
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for unfastened

unfasten

/ʌnˈfɑːsən/
verb
1.
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 unfastened

unfasten

v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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