Word.ws English Dictionary

undo

/ʌnˈduː/

undo verb: to reverse the effects of an action. Also the misspelling of undue.

Verb

undo (third-person singular simple present undoes, present participle undoing, simple past undid, past participle undone)

  1. (transitive) To reverse the effects of an action.
    • Fortunately, we can undo most of the damage to the system by the war.
    • What's done can't be undone.
    Synonyms:
    cancel, reverse
  2. (transitive) To unfasten.
    • Could you undo my buckle for me?
  3. (colloquial, transitive) To unfasten the clothing of (a person).
    • PROSTITUTE: Undo me. There's a dear.1971, Dr Jekyll and Sister Hyde (film)
  4. (figuratively, transitive) To impoverish or ruin, as in reputation; to cause the downfall of.
    • Woe is me, for I am undone!1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC

Noun

undo (plural undos)

  1. (transitive) An operation that reverses a previous action.
    • How many undos does this program support?

Also used as

undo is also the misspelling of undue.

undo meaning in Hindi, Bengali, Malayalam and Gujarati

undo in Hindi

to reverse
उधेड़ना udheṛnā

undo in Bengali

পূর্বাবস্থায় নামিয়ে আনা

undo in Malayalam

പഴയപടിയാക്കാൻ, പഴയപടിയാക്കുവാൻ

undo in Gujarati

પૂર્વવત્ કરવા માટે, પૂર્વવત કરવા માટે, પૂર્વવત્ કરવા
More languagesFewer languages
undo in Nepali
पूर्ववत गर्न, पूर्ववत् गर्न
undo in Vietnamese
hoàn tác
Sindhi
اڻڪرڻ āṇkrṇ

Examples of undo in a sentence

  • He lost his patience trying to undo his shoe-lace, but tugging it made the knot even tighter.
  • He tied a complex knot so that others would find it hard to undo.
  • I downdated the database to undo the most recent update.

All 38 example sentences with undo

Synonyms of undo

Antonyms

All synonyms and antonyms of undo

Forms of undo

Verb
third-person singular presentundoes
present participleundoing
pastundid
past participleundone
Noun
pluralundos

Past tense of undo: undid

Origin of undo

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”).

Words formed from undo

Words that rhyme with undo

48 more rhymesFewer rhymes

Questions about undo

What does undo mean?
Undo means to reverse the effects of an action.
What is undo in Hindi?
Undo in Hindi is उधेड़ना (udheṛnā). See Undo meaning in Hindi.
What part of speech is undo?
Undo can be a verb or a noun.
How do you pronounce undo?
Undo is pronounced /ʌnˈduː/ (UK).
What is the past tense of undo?
The past tense of undo is undid.

Words near undo in the dictionary

  1. undivulged
  2. undivulging
  3. undizzied
  4. UNDM
  5. UNDMs
  6. undo
  7. undoability
  8. undoable
  9. undoables
  10. undoably
  11. undocile

Source and license

Adapted from Wiktionary: undo (page history and authors); undo (Bengali, IndicTrans2 machine translation) (model and license); undo (Malayalam, IndicTrans2 machine translation) (model and license); undo (Gujarati, IndicTrans2 machine translation) (model and license); undo (Nepali, IndicTrans2 machine translation) (model and license). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Vealhurl-undo.wav.

Cite this entry: “undo.” Word.ws, https://word.ws/undo. Based on Wiktionary, CC BY-SA 4.0.