ㄓㄣˋzhènㄅㄧˋㄏㄨ

  1. 大聲吶喊振奮人心號召群眾文選·李陵·蘇武》:振臂一呼。」攘臂一呼」。登高一呼

to issue a call for action, to raise one's hand and issue a rousing call (idiom)​