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