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unbutton

[uhn-buht-n] /ʌnˈbʌt n/
verb (used with object)
1.
to free (buttons) from buttonholes; unfasten or undo.
2.
to unfasten by or as if by unbuttoning:
to unbutton a jacket.
3.
to disclose (one's feelings, thoughts, etc.) after deliberate or prolonged silence.
verb (used without object)
4.
to unfasten a button or one's buttons.
Origin
1275-1325
1275-1325; Middle English unbotenen. See un-2, button
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un button

unbutton

/ʌnˈbʌtən/
verb
1.
to undo by unfastening (the buttons) of (a garment)
2.
(informal) to release or relax (oneself, tension, etc)
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 un button

unbutton

v.

early 14c., from un- (2) "opposite of" + button (v.). Related: Unbuttoned; unbuttoning.

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for un

2
4
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