cancel or reverse the effects or results of a previous action or operation, cause something that has been done to be no longer in existence

undo the damage, undo button, undo the past

Formal and Informal Expressions of undo

In different contexts, you can replace 'undo' with suitable alternatives. In a more formal setting, 'reverse, cancel' is apt. In informal speech or writing, 'take back, fix' is a commonplace synonym.

undo: Explore its Definition & Usage

undo Definition

1cancel or reverse the effects or results of a previous action or operation
2cause something that has been done to be no longer in existence

Using undo: Examples

Take a moment to familiarize yourself with how "undo" can be used in various situations through the following examples!

Example
I wish I could undo all the mistakes I made.
Example
The software allows you to undo your last action.
Example
The damage was irreversible and could not be undone.
Example
He tried to undo the knot, but it was too tight.

undo Synonyms and Antonyms

Synonyms for undo

Antonyms for undo

Phrases with undo

undo the damage
repair or reverse the negative effects of something
Example
It will take years to undo the damage caused by the oil spill.
undo button
a feature in software applications that allows users to reverse their last action
Example
If you make a mistake, just click the undo button to fix it.
undo the past
change or erase events or actions that have already happened
Example
I wish I could undo the past and make different choices.

Origins of undo

from Old English 'undon', meaning 'to unfasten'

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Summary: undo in Brief

'Undo' [ˌʌnˈduː] is a verb that means to cancel or reverse the effects of a previous action or operation. It can also mean to cause something that has been done to be no longer in existence. Examples include 'The software allows you to undo your last action,' and 'He tried to undo the knot, but it was too tight.' Phrases like 'undo the damage' and 'undo button' are common.