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
According to reports, Brand, appearing on video wearing a denim shirt with a number of buttons undone, spoke only to confirm his name and date of birth in the six-minute hearing.
—
Alex Ritman, Variety, 20 Jan. 2026
Murkowski and several other Republicans have already helped pass resolutions last year meant to undo tariffs around the globe, but those pieces of legislation did not gain traction in the House.
—Stephen Groves, Denver Post, 18 Jan. 2026
The Bills finished the game with 100 more yards than the Broncos, but were undone by untimely turnovers — five total as a team, including four by Josh Allen, who had committed only six turnovers through his first 14 playoff games prior to tonight.
—Hannah Keyser, CNN Money, 18 Jan. 2026
Any direct confrontation would threaten to undo 70 years of security and stability in the Atlantic under the NATO alliance.
—Kayla Hayempour, NBC news, 18 Jan. 2026
See All Example Sentences for undo
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Alex Ritman, Variety, 20 Jan. 2026
Murkowski and several other Republicans have already helped pass resolutions last year meant to undo tariffs around the globe, but those pieces of legislation did not gain traction in the House.
—Stephen Groves, Denver Post, 18 Jan. 2026
The Bills finished the game with 100 more yards than the Broncos, but were undone by untimely turnovers — five total as a team, including four by Josh Allen, who had committed only six turnovers through his first 14 playoff games prior to tonight.
—Hannah Keyser, CNN Money, 18 Jan. 2026
Any direct confrontation would threaten to undo 70 years of security and stability in the Atlantic under the NATO alliance.
—Kayla Hayempour, NBC news, 18 Jan. 2026
See All Example Sentences for undo
Cite this Entry
“Undo.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/undo. Accessed 27 Jan. 2026.
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