- A witty person.
- An oscillating movement.
"The wag of my dog's tail expresses happiness."
- To swing from side to side, especially of an animal's tail
- (obsolete) To go; to depart.
- (obsolete) To be in action or motion; to move; to get along; to progress; to stir.
- (Britain, Australia, slang) To play truant from school.