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."
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The teachers were up in arms over the scandal.
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Foo Fighters song,one of the best songs ever
foo's new song up in arms is awesome
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(v.) to arm oneself or a group to attack a force.
The militia took up arms against the invaders.
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It means you’re the Fukin best and everyone knows u
Look *name* is 3 fingers up /arms crossed and 3 fingers up on each hand that means he must be the best