1.raise one's arm in a call for action; raise one's hand and issue a rousing call; raise one's arm and cry for action -- to issue a call for action; sound the trumpet call of action
raise arm in call for action
振_百度百科 ... 1.振臂[ raise one’s arm] 2.振臂一呼[ raise arm in call for action] 3.振怖[ fear; dread] ...
振臂一呼