/ɑ:mz ||; ɑrmz/noun[pl] 1 weapons, especially those that are used in war 武器（尤指在战争中使用的）: a reduction in nuclear arms 裁减核武器
2 =COAT OF ARMS
up in arms protesting angrily about sth 愤怒抗议:
The workers were up in arms over the news that the factory was going to close. 工厂即将关闭的消息引起工人愤怒抗议。