unbutton

To unfasten the buttons of.

To free or remove (a button) from a buttonhole.

To open as if by unbuttoning.

To undo buttons.

To unfasten or open, as a garment, by separating the buttons and the buttonholes.

To loose the buttons of; to unfasten.

To unfasten buttons

To open something by undoing its buttons

undo the buttons of