Definition of "undoer" [un•do•er]

• Agent noun of undo; one who undoes. (noun)

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• "I don't think Kinsella is a thinker; he's a doer, or more accurately an undoer."
• "I was seized, disarmed, and withheld by two footmen; and in this situation felt the most exquisite torture in beholding my undoer approach with his young wife."
• "She sought not to know the object for which she was forsaken; she meant not to upbraid her undoer; her aim was to find"