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View synonyms for undo

undo

[uhn-doo]

verb (used with object)

undid, undone, undoing. 
  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.



undo

/ ʌnˈduː /

verb

  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

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Other Word Forms

  • undoable adjective
  • undoer noun
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Word History and Origins

Origin of undo1

First recorded before 900; Middle English; Old English undōn; cognate with Dutch ontdoen; un- 2, do 1
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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Even some backers of Proposition 50 flinched at the notion of sidelining the redistricting commission and undoing its painstaking, nonpartisan work.

Read more on Los Angeles Times

The regulation that would undo this framework is slated to be formally proposed by December, according to a federal bulletin, although that deadline could push into next year, multiple officials said.

Read more on Salon

A 10-week study undid about 10 years’ worth of brain aging, they found.

Read more on MarketWatch

Katz said that Mono Lake “needs to be vibrant” and that the city has “an obligation to help undo some of the damage we did up there.”

Read more on Los Angeles Times

The traditional ways to undo such a decision would have been for the legislature to pass a new law that made gerrymandering legal or for Republicans to file a lawsuit.

Read more on Salon

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