Take It Outside Meaning

(idiomatic) To move to a location outside the current location, in order to escalate an altercation or fight.

Example:   If you want a piece of me, let's take it outside!
2004 Jan. 5, Brian Knowlton, "Dean and Lieberman tangle during debate in Iowa," New York Times (retrieved 15 Sep 2015):
  At one point, the interplay between Lieberman and Dean was so pointed that a moderator jokingly asked the two "to take it outside."