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Adjective: up in arms
  1. (informal) angry; preparing or planning for a fight

Nearest

unwritten law
unyielding
unyieldingness
unyoke
unzip
up
up and down
up for
up for grabs
up here
up in arms
up in the air
up on
up quark
up the creek
up the stairs
up to
up to her neck
up to his neck
up to my neck
up to now