English Explanatory Dictionary

undo

English dictionary entry

Meanings

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.
adj
  1. Misspelling of undue.

Pronunciation

/ʌnˈduː/ LL-Q1860 (eng)-Vealhurl-undo.wav

Word forms

undo undoes undoing undid undone undos

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”).

Synonyms

cancel reverse unbuckle unbutton untie unzip

Antonyms

redo do up button button up tie up zip zip up

Derived words

what's done cannot be undone
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