undo
verbUK /ʌnˈduː/
US /ʌnˈduː/
To undo means to open or unfasten something that was tied or closed.
She had to undo her shoelaces before taking off her shoes.
OTHER MEANINGS
2. To cancel or reverse something you did, like a mistake.
You can undo your last change by pressing this button.
3. To ruin or destroy something.
The heavy rain undid all our hard work in the garden.
4. To make someone very upset or worried.
The bad news completely undid him.