Meaning

Riled up or ready to fight, hot and mad.

Origin

From 16th-century England, tied to war; 'up in arms' meant revolt, slang by 1570s in a play for rage. A 1600s pamphlet uses it for a riot.

Variants

  • In arms

Usage Examples

  • They're up in arms over the new rule.
  • Up in arms; he's mad as hell.
  • In arms about that cut-fight!

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