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undo

Pronunciation: /ʌnˈduː/

The English word “undo” has 5 meanings listed here.

verb

  1. To reverse the effects of an action.
  2. To unfasten.
  3. To unfasten the clothing of (a person).
  4. To impoverish or ruin, as in reputation; to cause the downfall of.

noun

  1. An operation that reverses a previous action.

Etymology

From Middle English undōn, from Old English ondōn, from Proto-West Germanic *andadōn (“to undo”), equivalent to un- + do. Cognate with West Frisian ûndwaan, ûntdwaan (“to undo; rid”), Dutch ontdoen (“to undo”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.