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To square up to someone in order to incite a violent reaction. To let someone know that you won't take shit from them, and you are willing to throw down if necessary.
"Some guy rared up to me, so I knocked him out cold."

"This guy was getting mouthy, so I was gonna rare up to him until my friend stopped me."
by Nick Fletcher January 30, 2007

Words related to rare up

brawl fight square off throw down tussle