Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “undo”

undo

verb [T] (REMOVE EFFECTS)    /ʌnˈduː/ (present participle undoing, past tense undid, past participle undone)
B2 to remove the good or bad effects of an action or several actions: I did a really tough aerobics class and then went out for a meal and undid (all) the good work! It's very difficult to undo the damage that's caused by inadequate parenting in a child's early years.Destroying and demolishingDamaging and spoiling
(Definition of undo verb (REMOVE EFFECTS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of undo

More definitions for “undo”

Definitions of “undo” in other dictionaries

Word of the Day

exercise

physical activity that you do to make your body strong and healthy

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More