undo meaning and definition

UNDO verb

Definition of undo (verb)

1. cancel, annul, or reverse an action or its effect
   • "I wish I could undo my actions"
2. deprive of certain characteristics
   • synonyms: unmake
   • antonym: do
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"
   • synonyms: loosen, untie
5. remove the outer cover or wrapping of
   • "Let's unwrap the gifts!"; "undo the parcel"
   • synonyms: unwrap
   • antonym: wrap