unbutton

From Wiktionary

Word parts[change]

un- + button

Pronunciation[change]

Verb[change]

Plain form
unbutton

Third-person singular
unbuttons

Past tense
unbuttoned

Past participle
unbuttoned

Present participle
unbuttoning

  1. (transitive & intransitive) If you unbutton something, you open it by undoing its buttons.