Verb
1. cancel, annul, or reverse an action or its effect;
"I wish I could undo my actions"2. deprive of certain characteristics
3. cause the ruin or downfall of;
"A single mistake undid the President and he had to resign"4. cause to become loose;
"undo the shoelace""untie the knot""loosen the necktie"5. remove the outer cover or wrapping of;
"Let's unwrap the gifts!""undo the parcel"