Undo | Mean of undo in English Dictionary

/ˌʌnˈduː/

• Verb
• to open or release (something)
1. undo a belt/button/zipper
2. She undid [=unbuttoned] her blouse.
3. I can't undo [=untie] this knot.
• to change or stop the effect of (something)
1. You can't undo the past.
2. The damage cannot be undone.
3. (computers) Will the program let me undo a change if I make a mistake?
• to cause the failure of (someone or something)
1. He was undone by greed.