Unbutton

//ʌnˈbʌtən// verb

Definitions

Verb
  1. 1
    To open (something) by undoing its buttons. ambitransitive

    "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. 2
    undo the buttons of wordnet
  3. 3
    To come open by having its buttons unfastened. ergative, intransitive

    "He was so muscled and firm, and the canvas shirt under his jacket unbuttoned easily."

Etymology

From Middle English onbottonen, unbotonen; equivalent to un- + button.

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