undo

Word parts

un- + do

Pronunciation

• IPA ^(key): /ʌnˈduː/
• SAMPA: /Vn"du:/

• Audio (UK)

  (file)

• Hyphenation: un‧do
• Homophone: undue

Verb

Plain form undo

Third-person singular undoes

Past tense undid

Past participle undone

Present participle undoing

1. (transitive) If you undo an action, you reverse it.

   We can undo the damage to the system.

2. (transitive) If you undo something, unfasten it.

   Could you undo my buckle for me?

3. (computing) If you undo something in a computer program, you reverse a change done in the file.
   • Antonym: redo

   I had to undo all of the bad edits that my naughty little brother made.

Noun

Singular undo

Plural undoes

1. (countable) (computing) An undo is a function in a computer program that can reverse a change done to a file.

   This program can do up to 20 undoes.