Simple Definition of undo
: to open or release (something) : to unfasten or loosen (something)
: to change or stop the effect of (something)
: to cause the failure of (someone or something)
Full Definition of undo
1 : to open or loose by releasing a fastening
2 : to make of no effect or as if not done : make null : reverse
: to come open or apart
Examples of undo
You can't undo the past.
The damage cannot be undone.
He was undone by greed.
Before 12th Century
First Known Use of undo
before 12th century
Rhymes with undo
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Seen and Heard
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