To open (something) by undoing its buttons.
Being now too high wound up to bear a delay, he unbutton'd, and drawing out the engine of love-assaults, drove it currently, as at a ready-made breach
To come open by having its buttons unfastened.
He was so muscled and firm, and the canvas shirt under his jacket unbuttoned easily.
From Middle English onbottonen, unbotonen; equivalent to un- + button.
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