undo

verb

un·​do ˌən-ˈdü How to pronounce undo (audio)
ˈən-
undid ˌən-ˈdid How to pronounce undo (audio)
ˈən-
; undone ˌən-ˈdən How to pronounce undo (audio)
ˈən-
; undoing ˌən-ˈdü-iŋ How to pronounce undo (audio)
ˈən-

transitive verb

1
: to open or loose by releasing a fastening
2
: to make of no effect or as if not done : make null : reverse
3
a
: to ruin the worldly means, reputation, or hopes of
a politician undone by scandal
b
: to disturb the composure of : upset
she's come undone

intransitive verb

: to come open or apart
undoer noun

Examples of undo in a Sentence

You can't undo the past. The damage cannot be undone. He was undone by greed.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The government’s ruinous racial policies over the past half century were created primarily by executive order, not legislation, and what was done with the mere stroke of a presidential pen can be undone by the same means. The Editors, National Review, 23 Jan. 2025 Trump: 'A lot of work' undoing Biden's mistakes Former President Joe Biden, who left office with an abysmal 36% approval rating, and his out-of-power party remains one of Trump's favorite targets. Phillip M. Bailey, USA TODAY, 23 Jan. 2025 Mountain ranges are graveyards of ghost areas, abandoned by skittish investors or undone by the fickleness of weather gods. John Branch, New York Times, 23 Jan. 2025 Diversity, Equity, and Inclusion (DEI) Shifts On his first day back in office, Trump vowed to undo the progress made in creating diverse workplaces by terminating federal DEI programs and reversing protections for transgender individuals. Sughnen Yongo, Forbes, 23 Jan. 2025 See all Example Sentences for undo 

Word History

First Known Use

before the 12th century, in the meaning defined at transitive sense 1

Time Traveler
The first known use of undo was before the 12th century

Dictionary Entries Near undo

Cite this Entry

“Undo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undo. Accessed 30 Jan. 2025.

Kids Definition

undo

verb
un·​do ˌən-ˈdü How to pronounce undo (audio)
ˈən-
undid -ˈdid How to pronounce undo (audio) ; undone -ˈdən How to pronounce undo (audio) ; undoing -ˈdü-iŋ How to pronounce undo (audio)
1
: to make or become unfastened or loosened : open, untie
undo a knot
2
: to destroy the effect of : nullify, reverse
3
a
: to cause the ruin of
your stubbornness undid you
undone by greed
b
: to disturb the calmness of : upset
she's come undone
undoer noun

More from Merriam-Webster on undo

Last Updated: - Updated example sentences
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