up in arms

(idiom) protest strongly about something

Example Sentences:

The hockey fans were up in arms when their team got an unfair penalty in the last few minutes of the game.

A: How are you doing?
B: I’m up in arms!
A: Why?
B: I tried to get a ticket to go see my favourite artist, but the concert is sold out.

The students were up in arms when their teacher gave them an unfair test.

From the Blogs:

Consumer groups up in arms over massive penalty fees

Media: