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Meaning of undo

un•do

Pronunciation: (un-d'), [key]
— -did, -done, -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. to explain; interpret.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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