振ㄓㄣˋzhèn臂ㄅㄧˋbì一ㄧyī呼ㄏㄨhū

揮臂大聲吶喊，以振奮人心，號召群眾。《文選·李陵·答蘇武書》：「然陵振臂一呼，創病皆起。」也作「攘臂一呼」。似登高一呼

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