The phrase "doth right by" is a literary expression that means to act fairly, justly, or honorably towards someone. Some of the antonyms for this phrase include mistreat, harm, injure, cheat, deceive, exploit, manipulate, or take advantage of others. These words describe behavior that is dishonest, unjust, or unethical. They represent actions that are selfish and motivated by personal gain rather than a sense of morality and justice. When we use the phrase "doth right by," we express our belief that people should act with integrity and treat others with respect and dignity, rather than causing harm or injustice.