To come open or unfastened.
(Intransitive) To commence firing weapons.
To become open
To provide or be provided with a button or buttons
Find another word for unbutton. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for unbutton, like: undo, open-up, unfasten, open, button, unlace, untuck, leopard-skin, cravat and pantaloon.