verb

associate or form a friendship with someone, especially when one is not supposed to.

she ignored Elisabeth’s warning glare against fraternizing with the enemy

associate,mix,mingle,consort,socialize,go around,keep company,rub shoulders,hang around,hang round,hang about,hang out,run around,knock about,knock around,hobnob,pal up,pal around,chum around,be thick with,rub elbows