Top Definition
to be in an extremely angry or agitated state
"My father was up in arms when he found out my sister became pregnant before she got married."
by Polo May 18, 2007
2 more definitions
angry and ready to fight
The teachers were up in arms over the scandal.
by The Return of Light Joker March 29, 2009
Foo Fighters song,one of the best songs ever
foo's new song up in arms is awesome
by yuoub September 08, 2007

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