Defining Undo

Definitions of undo on the web:

-cancel, annul or reverse an action or its effect, 'I wish i could undo my actions.'
-unmake: deprive of certain characteristics
-cause the ruin or down fall of; ' A single mistake undid the president and he had to resign.'
-untie: cause to become loose; 'undo a shoelace' 'untie a knot'
-unwrap: to remove the outer cover of; 'lets unwrap the gifts'