1. not done; not accomplished or completed.


  1. past participle of undo.


  1. brought to destruction or ruin.
  2. unfastened.

verb (used with object), un·did, un·done, un·do·ing.

  1. to reverse the doing of; cause to be as if never done: Murder once done can never be undone.
  2. to do away with; erase; efface: to undo the havoc done by the storm.
  3. to bring to ruin or disaster; destroy: In the end his lies undid him.
  4. to unfasten by releasing: to undo a gate; to undo a button.
  5. to untie or loose (a knot, rope, etc.).
  6. to open (a package, wrapping, etc.).
  7. Archaic. to explain; interpret.


  1. not done or completed; unfinished


  1. ruined; destroyed
  2. unfastened; untied

verb -does, -doing, -did or -done (mainly tr)

  1. (also intr) to untie, unwrap, or open or become untied, unwrapped, etc
  2. to reverse the effects of
  3. to cause the downfall of
  4. obsolete to explain or solve

adj.“not accomplished,” c.1300, from un- (1) + done. The same word meaning “destroyed” is recorded from mid-14c., past participle adjective from undo. v.Old English undon “to unfasten and open” (a window or door), “to unfasten by releasing from a fixed position,” from un- (2) + do (v.). The notion is of “to annul something that was done.” Related: Undone; undoing.

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