undid
ˌən-ˈdid 
ˈən-
; undone
ˌən-ˈdən
ˈən-
; undoing
ˌən-ˈdü-iŋ
ˈən-
; undoes
ˌən-ˈdəz,
ˈən-
1
: to open or loosen by releasing a fastening
undid her jacket
2
: to make of no effect or as if not done : make null : reverse
The damage cannot be undone.
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
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
Brooklyn opened 2026 with a second straight loss and fell to 10-21, undone by a sluggish start, uneven offense and a Rockets team that continued to pour it on as the night wore on.
—
C.j. Holmes, New York Daily News, 2 Jan. 2026
Dedicated Baltimoreans have spent their days and nights for the past 20 years undoing that reputation and trying to prove that Baltimore, a Black city, is a promising place.
—Nicolas Johnson-Smith, Baltimore Sun, 2 Jan. 2026
The president basically undid what has been the understanding about immigration law going back many, many decades.
—Dana Taylor, USA Today, 31 Dec. 2025
Meanwhile, survivors who sought to remain anonymous saw their names published, and attempts to obscure other information within the records could be undone with a simple copy and paste.
—Harmeet Kaur, CNN Money, 31 Dec. 2025
See All Example Sentences for undo
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C.j. Holmes, New York Daily News, 2 Jan. 2026
Dedicated Baltimoreans have spent their days and nights for the past 20 years undoing that reputation and trying to prove that Baltimore, a Black city, is a promising place.
—Nicolas Johnson-Smith, Baltimore Sun, 2 Jan. 2026
The president basically undid what has been the understanding about immigration law going back many, many decades.
—Dana Taylor, USA Today, 31 Dec. 2025
Meanwhile, survivors who sought to remain anonymous saw their names published, and attempts to obscure other information within the records could be undone with a simple copy and paste.
—Harmeet Kaur, CNN Money, 31 Dec. 2025
See All Example Sentences for undo
Cite this Entry
“Undo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undo. Accessed 9 Jan. 2026.
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