be up in arms
idiomPart ofarms
be up in arms — idiom
1. to be very angry and upset about something, and to protest or complain about it
1.idiom
Definition
to be very angry and upset about something, and to protest or complain about it loudly and publicly.
Example
Residents were up in arms about the plan to build a factory next to the elementary school.
Teachers across the city were up in arms over the sudden budget cuts to public education.