Hypertext Webster Gateway: "unbutton"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unbutton \Un*but"ton\, v. t. [1st pref. un- + button.]
To loose the buttons of; to unfasten.
From WordNet (r) 1.7 (wn)
unbutton
v : undo the buttons of; "unbutton the shirt" [ant: {button}]
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