Wiktionary
lawyer up
vb. 1 (context intransitive chiefly US informal English) To exercise one's right to legal representation, especially on the occasion of refuse to answer law-enforcement officials' questions without the presence of such legal representation. 2 (context intransitive chiefly US informal business English) To conduct matters in accord with legal formalities or so as to avoid legal risk. 3 (context transitive informal business English) To arrange in a way reflecting legal advice.