English · Word Candidate

undo

/ʌnˈduː/

Proposed by a contributor, not yet supported by evidence.

Also seen as: undoes · undoing · undid · undone

Sense 1

Meaning · English

To reverse the effects of an action.

Verb

Fortunately, we can undo most of the damage to the system by the war.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Meaning · English

To unfasten.

Verb

Could you undo my buckle for me?

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

Meaning · English

An operation that reverses a previous action.

Noun

How many undos does this program support?

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).

What does “undo” mean?

To reverse the effects of an action.

Is “undo” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.