Synonyms and related words :
act the traitor, associate with, assort with, be acquainted with, be friends, be inseparable, chum, chum together, chum with, clique, clique with, club together, collaborate, consort with, cotton to, fall in with, fellowship, flock together, fraternize with, hang around with, hang out with, herd together, hit it off, hobnob with, join, join in fellowship, keep company with, keep up with, know, mingle with, mix with, pal, pal up with, pal with, quisle, run in couples, run with, sort with, take up with, tie up with, turn against