WAG

(MOVE) [verb] -gg- - (esp. of a tail or finger) to move from side to side or up and down, esp. quickly and repeatedly, or to cause this to happenThe little dog's tail wagged in delight. [I]Wagging his finger sternly, he told them never to go into the attic again. [T](figurative) They tried to keep their affair secret, but it wasn't long before tongues began to wag (= people began to notice and talk about it). [I]