Un fasten

unfasten

[uhn-fas-uhn, -fah-suhn]
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; 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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Collins
World English Dictionary
unfasten (ʌnˈfɑːsən)
 
vb
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
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Etymonline
Word Origin & History

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