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Definition of unfasten - 3 dictionary results

un⋅fas⋅ten

  [uhn-fas-uhn, -fah-suhn]
Use unfasten in a Sentence
–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; ME unfastnen. See un- 2 , fasten
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unfasten
un·fas·ten   (ŭn-fās'ən)   
v.   un·fas·tened, un·fas·ten·ing, un·fas·tens

v.   tr.
To separate the connected parts of.
v.   intr.
To become loosened or separated.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unfasten 
c.1225, from un- (2) + fasten.
Online Etymology Dictionary, © 2001 Douglas Harper
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