FluentPlex

undo

/ʌnˈduː/ verb B1
  1. To reverse the effects of an action. (transitive) · Fortunately, we can undo most of the damage to the system by the war.· What's done can't be undone.
  2. To unfasten. (transitive) · Could you undo my buckle for me?
  3. To unfasten the clothing of (a person). (colloquial, transitive)
  4. To impoverish or ruin, as in reputation; to cause the downfall of. (figuratively, transitive)

He/she/it undoes · Past undid · Past participle undone · -ing form undoing

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Verb forms

Base form
undo
He/she/it
undoes
Past
undid
Past participle
undone
-ing form
undoing

An irregular verb: learn its past and past participle by heart.

From the library

One of them picked up an axe that lay upon the path, and said, “I have found an axe.” “Nay, my friend,” replied the other, “do not say ‘I,’ but ‘We’ have found an axe.” They had not gone far before they saw the owner of the axe pursuing them, and he who had picked up the axe said, “We are undone.” “Nay,” replied the other, “keep to your first mode of speech, my friend; what you thought right then, think right now.
Three Hundred Aesop's Fables, p. 41 · B2
Say ‘I,’ not ‘We’ are undone.”
Three Hundred Aesop's Fables, p. 41 · B2
Should it miscarry, you are undone.
The Valley of Fear, p. 4 · C1
the next word is ‘pig’s-bristles.’ We are undone, my good Watson!
The Valley of Fear, p. 7 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.