1. undo

cancel, annul, or reverse an action or its effect

Example Sentences:
'I wish I could undo my actions'

2. undo, unmake

deprive of certain characteristics

• unmake

3. undo

cause the ruin or downfall of

Example Sentences:
'A single mistake undid the President and he had to resign'

4. loosen, undo, untie

cause to become loose

Example Sentences:
'undo the shoelace'
'untie the knot'
'loosen the necktie'

• loosen
• untie

5. undo, unwrap

remove the outer cover or wrapping of

Example Sentences:
'Let's unwrap the gifts!'
'undo the parcel'

• unwrap