Up in the arms

 こっちなのかと思ったら、

  *up in arms 

1. Fig. in armed rebellion. (*Typically: be ~; get ~.) The entire population is up in arms. They are up in arms, ready to fight.

2. Fig. very angry. (Fig. on {2}, but without weapons. *Typically: be ~; get ~.) Wally was up in arms about the bill for the broken window. I am really up in arms about what happened.

「武器をもって戦闘する勢い」みたいな意味から、怒っているさま、をあらわすようになったみたいだね。



Russia up in arms over Chinese theft of military technology Beijing's rise as a major armaments exporter is a double-edged sword for Moscow DIMITRI SIMES, Contributing writer DECEMBER 20, 2019 18:00 JST 

中国がロシアの軍事技術をパクっているのに怒り心頭だ、と。

 "It's becoming increasingly difficult to offer China anything new, so Russian policy is to move away from arms sales to joint development," he said. "I don't know to what extent this new model will interest China,

ロシアも落ち目だねええ。