(꼬리 등을) 흔들기

wag(noun)

a single wagging movement

The dog's tail gave a feeble wag.

(동물이 꼬리 등을) 흔들다

wag(verb)

(especially of a dog's tail) to (cause to) move to and fro, especially from side to side

The dog wagged its tail with pleasure.