undo Meaning, definition in Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of "undo" - English Dictionary

See all translations

undoverb [T]

uk   us   /ʌnˈduː/ (present participle undoing, past tense undid, past participle undone)

undo verb [T] (UNFASTEN)

B2 to unfasten something that is fastened or tied: Can someone help me to undo my seat belt?
More examples

undo verb [T] (REMOVE EFFECTS)

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.
(Definition of undo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of undo?
Add Cambridge dictionaries to your browser to your website

Definitions of “undo” in other dictionaries

Word of the Day
lap

to go past someone in a race who has been round the track one less time than you

Word of the Day

Are you a glass-half-full person? (Everyday Idioms)
Are you a glass-half-full person? (Everyday Idioms)
by Kate Woodford,
July 29, 2015
A reader of this blog recently asked for a post on idioms that are used in everyday English. This seemed like a reasonable request. After all, if you are going to make the effort to learn a set of English idioms, you want those idioms to be useful. The question, then, was

Read More 

exoskeleton noun
exoskeleton noun
July 27, 2015
a robotic device which goes around the legs and part of the body of a person who cannot walk and allows them to move independently and in an upright position The device, known as an exoskeleton, is strapped to the outside of a person’s limbs and can then be controlled by them.

Read More