verb (used with object)
- to free (buttons) from buttonholes; unfasten or undo.
- to unfasten by or as if by unbuttoning: to unbutton a jacket.
- to disclose (one’s feelings, thoughts, etc.) after deliberate or prolonged silence.
verb (used without object)
- to unfasten a button or one’s buttons.
- to undo by unfastening (the buttons) of (a garment)
- informal to release or relax (oneself, tension, etc)
v.early 14c., from un- (2) “opposite of” + button (v.). Related: Unbuttoned; unbuttoning.