up in arms about (something)

up in arms about (something)

Very upset or angry about something. Likened to an armed rebellion, from which the phrase originated. The whole town is up in arms about the addition of a new shopping center. Mom was really up in arms about the dent in her brand-new car.
See also: arm, up

up in arms about

protesting angrily about something.
1994 Asian Times A lack of checks and balances…or legal redress for workers have trade unions up in arms.
See also: arm, up