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un- +‎ button



unbutton (third-person singular simple present unbuttons, present participle unbuttoning, simple past and past participle unbuttoned)

  1. (transitive, intransitive) To open (something) by undoing its buttons.
    • 1749, [John Cleland], “(Please specify the letter or volume)”, in Memoirs of a Woman of Pleasure [Fanny Hill], London: [] G. Fenton [i.e., Fenton and Ralph Griffiths] [], OCLC 731622352:
      Being now too high wound up to bear a delay, he unbutton'd, and drawing out the engine of love-assaults, drove it currently, as at a ready-made breach
  2. (intransitive, ergative) To come open by having its buttons unfastened.
    • 2010, Janet Chapman, Tempt Me If You Can (page 70)
      He was so muscled and firm, and the canvas shirt under his jacket unbuttoned easily.