To move or cause to move rapidly back and forth. The dog wagged its tail excitedly when it saw its owner.
To move (a finger or hand) to signal disapproval or reprimand. She wagged her finger at the children to warn them to stop misbehaving.
To move (one's tongue) in talking, especially in a gossiping or idle manner. He wagged his tongue about the latest office rumors.
Austral., NZ slang: to stay away from school or work without permission; to play truant. They decided to wag school and spend the day at the beach.