UNDO meaning: Reversing an action or decision

We found 36 dictionaries that define the word undo:

General (26 matching dictionaries)

undo: Longman Dictionary of Contemporary English
undo: Merriam-Webster
undo: Oxford Learner's Dictionaries
undo: American Heritage Dictionary of the English Language
undo: Collins English Dictionary
undo: Vocabulary.com
Undo, undo: Wordnik
undo: Cambridge Advanced Learner's Dictionary
undo: Wiktionary
undo: Webster's New World College Dictionary, 4th Ed.
undo: The Wordsmyth English Dictionary-Thesaurus
undo: Infoplease Dictionary
undo: Dictionary.com
undo: Online Etymology Dictionary
undo: Cambridge Essential American English Dictionary
Undo (Rush of Fools song), Undo (Sanna Nielsen song), Undo: Wikipedia, the Free Encyclopedia
Undo: Online Plain Text English Dictionary
undo: Webster's Revised Unabridged, 1913 Edition
undo: Rhymezone
undo: AllWords.com Multi-Lingual Dictionary
undo: Webster's 1828 Dictionary
undo: FreeDictionary.org
undo: Mnemonic Dictionary
undo: TheFreeDictionary.com

Business (2 matching dictionaries)

MoneyGlossary.com (No longer online)
undo: Legal dictionary

Computing (3 matching dictionaries)

undo: CCI Computer
Webopedia (No longer online)
undo: Encyclopedia

Medicine (1 matching dictionary)

undo: Medical dictionary

Miscellaneous (1 matching dictionary)

Sound-Alike Words (No longer online)

Slang (1 matching dictionary)

Undo: Urban Dictionary

Tech (2 matching dictionaries)

Glossary of video terms (No longer online)
Sweetwater Music (No longer online)

(Note: See undid as well.)

Google, News, Images, Wikipedia, Reddit, BlueSky

Definitions from Wiktionary (

)

▸ verb:  To reverse the effects of an action.
▸ verb:  To unfasten.
▸ verb:  (figuratively) To impoverish or ruin, as in reputation; to cause the downfall of.
▸ noun:  (computing) An operation that reverses a previous action.
▸ adjective:  Misspelling of undue. [Excessive; going beyond that what is natural or sufficient.]