By the time patrol cars got to the friend's house, so had her lawyer. With her attorney running blocker, police could not even ascertain if Grubman had been driving the car, says Suffolk County district attorney James Catterson. "She was lawyered up, as we like to say."
(intransitive, chiefly US,informal, business) To conduct matters in accord with legal formalities or so as to avoid legal risk.
Whenever we do business with those guys, we lawyer up to protect ourselves.