Английский словарь американских идиом - up in arms

{adj. phr.} 1. Equipped with guns or weapons and ready to fight. * /All of the colonies were up in arms against the Redcoats./ Syn.: IN ARMS. 2. Very angry and wanting to fight. * /Robert is up in arms because John said he was stupid./ * /The students were up in arms over the new rule against food in the dormitory./