live together, cohabit
你邀请他跟你同居吗？
Did you invite him to move in with you?
— 英国病人 (1996)
拉蒙谎称丈夫玩牌作弊还逼妻子跟他同居当作人质
Ramon falsely accused the husband of cheating at cards and forced his wife to live with him as a hostage.
— 荒野大镖客 (1964)
他跟同居的白人女要生宝宝了
He and his white live-in girlfriend are going to have a baby.
— 大病 (2017)