unbutton

[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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbutton (ʌnˈbʌtən)
 
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
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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
And wear a shirt underneath that is presentable in case it gets beastly hot and
  you want to unbutton your jacket.
Then in meetings, you absentmindedly button and unbutton them.
They also felt enough confidence to unbutton and reproduce.
Some moms use pullover tops, shirts that can unbutton from the bottom, or
  blankets that cover them.
Synonyms
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