definition of
undo

[1] #1 undo v. cancel, annul, or reverse an action or its effect; "I wish I could undo my actions". wn

[2] #2 undo v. [unmake] deprive of certain characteristics. wn

[3] #3 undo v. cause the ruin or downfall of; "A single mistake undid the President and he had to resign". wn

[4] #4 undo v. [untie, loosen] cause to become loose; "undo the shoelace"; "untie the knot"; "loosen the necktie". wn

[5] #5 undo v. [unwrap] remove the outer cover or wrapping of; "Let's unwrap the gifts!"; "undo the parcel". wn