undid
ˌən-ˈdid 
ˈən-
; undone
ˌən-ˈdən
ˈən-
; undoing
ˌən-ˈdü-iŋ
ˈən-
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
c
: to come open or apart
Synonyms
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
There has been a favorite nearly undone by AI (very 2025), a favorite definitely undone by old tweets (very 2015) and an underdog that has in a matter of days become a favorite (very timeless).
—
Steven Zeitchik, The Hollywood Reporter, 14 Feb. 2025
Two of the department’s biggest funding streams — Title I and IDEA — also require action from Congress to be undone, as both were voted into law in 1965 and 1975 respectively.
—Molly Gibbs, The Mercury News, 13 Feb. 2025
The defending for Beto’s opener on 11 minutes was shoddy, with Slot’s side undone by a simple pass and run in behind.
—James Pearce, The Athletic, 13 Feb. 2025
For critics, this undoes any good Trump might have achieved in pressuring NATO nations to spend more on defense.
—Daryna Mayer, NBC News, 13 Feb. 2025
See all Example Sentences for undo 
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Steven Zeitchik, The Hollywood Reporter, 14 Feb. 2025
Two of the department’s biggest funding streams — Title I and IDEA — also require action from Congress to be undone, as both were voted into law in 1965 and 1975 respectively.
—Molly Gibbs, The Mercury News, 13 Feb. 2025
The defending for Beto’s opener on 11 minutes was shoddy, with Slot’s side undone by a simple pass and run in behind.
—James Pearce, The Athletic, 13 Feb. 2025
For critics, this undoes any good Trump might have achieved in pressuring NATO nations to spend more on defense.
—Daryna Mayer, NBC News, 13 Feb. 2025
See all Example Sentences for undo
Dictionary Entries Near undo
Cite this Entry
“Undo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undo. Accessed 21 Feb. 2025.
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