un·but·ton

[uhn-buht-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; Middle English unbotenen. See un-2, button

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Unbutton is one of our favorite verbs.
So is subtilize. Does it mean:
to introduce subtleties into or argue subtly about.
to flee; abscond:
Collins
World English Dictionary
unbutton (ʌnˈbʌtən) [Click for IPA pronunciation guide]
 
vb
1.  to undo by unfastening (the buttons) of (a garment)
2.  informal to release or relax (oneself, tension, etc)

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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Etymonline
Word Origin & History

unbutton
early 14c., from un- (2) + button (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Furthermore, he began to unbutton her shirt and pulldown her undershirt.
Some moms use pullover tops, shirts that can unbutton from the bottom, or
  blankets that cover them.
And wear a shirt underneath that is presentable in case it gets beastly hot and
  you want to unbutton your jacket.
She noted that he did not attempt to unbutton or take off her pants.
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