# up in arms

> English word · Adjective

## Definitions
1. Angry; incensed; preparing for a fight.
2. Vigourously protesting against something.
3. Armed for battle; prepared for or engaged in warfare.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/up-in-arms