unbutton

Etymology

From Middle English onbotton, unbotone; equivalent to un- + button.

verb

  1. (transitive, intransitive) To open (something) by undoing its buttons.
  2. (intransitive, ergative) To come open by having its buttons unfastened.
    He was so muscled and firm, and the canvas shirt under his jacket unbuttoned easily. 2010, Janet Chapman, Tempt Me If You Can, page 70

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