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undo JUST WRITTEN FOR YOU

/ʌnˈduː/ · un.do
noun
  1. An operation that reverses a previous action. How many undos does this program support?
verb
  1. To reverse the effects of an action. Fortunately, we can undo most of the damage to the system by the war.
  2. To unfasten. Could you undo my buckle for me?
verb
  1. To impoverish or ruin, as in reputation; to cause the downfall of. The scandal will undo the company's reputation.
Did you know? The word 'undo' is often used in computer programming to refer to a function that reverses a previous action, such as 'undoing' a change made to a document.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 16, 2026