up in arms

Definition

Angry; incensed; preparing for a fight.

Etymology

From a now-obsolete sense of up (“in revolt”).

Example Sentences

• "Near-synonym: in the streets"
• "The union members are up in arms over threats of pay cuts."
• "Lan[caster]. My lord, will you take armes against the king? Bish[op]. What neede I, God himselfe is vp in armes, When violence is offered to the church."