Up in arms

adj

Definitions

Adjective
  1. 1
    Angry; incensed; preparing for a fight. figuratively, not-comparable

    "Near-synonym: in the streets"

  2. 2
    Armed for battle; prepared for or engaged in warfare. not-comparable, uncommon

    "March on, march on, ſince we are vp in Armes, If not to fight with forraine Enemies, Yet to beat downe theſe Rebels here at home."

Etymology

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

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