idiom
call to arms
为了捍卫某个原因而采取行动的号召
Meaning
a call to take action, especially to defend a cause
Example
The leader’s speech was a **call to arms** for all citizens to fight corruption.
领导人的演讲是一个**号召大家行动起来**,呼吁所有公民与腐败作斗争。