to cause (something fastened or held at one end) to move rapidly and repeatedly back and forth, from side to side, or up and down: the dog wagged his tail
to shake (a finger) or nod (the head), as in summoning, reproving, etc.
to move (the tongue) in talking, esp. in idle or malicious gossip
intransitive verb
to move rapidly and repeatedly back and forth, from side to side, or up and down: said as of a part of the body
to keep moving in talk, esp. in idle or malicious gossip: said of the tongue