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Undo \un*do"\, v. t. [AS. und?n. See 1st Un-, and Do to perform.]

  1. To reverse, as what has been done; to annul; to bring to naught
    What's done can not be undone. --Shak
    To-morrow, ere the setting sun, She 'd all undo that she had done. --Swift
  2. To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve; as, to undo a knot; to undo a puzzling question; to undo a riddle. --Tennyson
    Pray you, undo this button. --Shak
    She took the spindle, and undoing the thread gradually, measured it. --Sir W Scott
  3. To bring to poverty; to impoverish; to ruin, as in reputation, morals, hopes, or the like; as, many are undone by unavoidable losses, but more undo themselves by vices and dissipation, or by indolence
    That quaffing and drinking will undo you, --Shak
  4. Cancel or reverse an action or its effect; "I wish I could undo my actions"
  5. Deprive of certain characteristics [syn: unmake] [ant: do]
  6. Make undone; revert to the original condition or situation; "You cannot undo the damage!"

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