undo

cancel, annul, or reverse an action or its effect; "I wish I could undo my actions"

deprive of certain characteristics

cause the ruin or downfall of; "A single mistake undid the President and he had to resign"

cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie"

remove the outer cover or wrapping of; "Let's unwrap the gifts!"; "undo the parcel"