undo
3 ENTRIES FOUND:
Britannica Dictionary definition of UNDO
[+ object]
1
:
to open or release (something)
:
to unfasten or loosen (something)
-
undo a belt/button/zipper
-
She undid [=unbuttoned] her blouse.
-
I can't undo [=untie] this knot.
2
:
to change or stop the effect of (something)
:
reverse
-
You can't undo the past.
-
The damage cannot be undone.
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(computers) Will the program let me undo a change if I make a mistake?
3
formal
:
to cause the failure of (someone or something)
-
He was undone by greed.
