verb, directional, punctuation · to wave, brandish, or shake something such as a hand, flag, or weapon

他向岸上的朋友挥手致意。

verb · to command, direct, or conduct

将军挥师北上，准备收复失地。

idiom · to scatter, disperse, or wipe away (often liquids or money)

他在赛场上挥汗如雨。