a call to arms

a call to defend or make ready for confrontation

戰(zhàn)斗號(hào)令

in arms

armed; prepared to fight

武裝的；準(zhǔn)備戰(zhàn)斗的

lay down (one's) arms

cease fighting

停止戰(zhàn)斗，投降

take up arms

begin fighting

開(kāi)始戰(zhàn)斗

under arms

equipped and ready for war or battle

處于戰(zhàn)備狀態(tài)的

up in arms (about/over)

protesting vigorously about something

強(qiáng)力反對(duì)…

teachers are up in arms about new school tests.

老師們強(qiáng)力反對(duì)新的學(xué)校測(cè)試。