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.
If governments, businesses, and financial institutions continue to sidestep worst-case scenarios, a half-century of gains in global prosperity could be undone in a matter of decades. Ingmar Rentzhog, Forbes, 28 Feb. 2025 Education organizations have been urging a measured approach, warning institutions not to make any hasty cuts that would be difficult to undo. Collin Binkley, Chicago Tribune, 27 Feb. 2025 Yet, despite progress, recent global shifts in diversity, equity, and inclusion (DEI) policies are undoing critical steps forward. Jessica Smith, TIME, 26 Feb. 2025 Marcos Llorente fired in Atletico’s third from the edge of the area and then, with 93 minutes on the clock, Barca were undone by a long ball forward and Samuel Lino crossed for Alexander Sorloth to make it 4-4 ahead of the second leg at the Metropolitano on April 2. Laia Cervelló Herrero, The Athletic, 26 Feb. 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

Browse Nearby Words

Cite this Entry

“Undo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undo. Accessed 3 Mar. 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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