right side, on someone's
Also, on someone's good side. In someone's favor. It is often put as get or keep or stay on someone's right side , as in We must get on Bill's right side if we're to get approval of our plans, or Jane had a hard time staying on the good side of her difficult supervisor. The antonym on someone's wrong side, means "in someone's disfavor," as in I got on her wrong side by opening my mouth once too often. Also see wrong side.