The phrase "use for ends" can mean to exploit or manipulate someone for personal gain. Synonyms for this phrase include: manipulate, exploit, take advantage of, use, use for one's own purposes, leverage, capitalize on, turn to one's advantage, and utilize. These synonyms all carry a negative connotation and suggest using someone for personal benefit without considering their well-being. It is important to recognize that using someone for one's own ends is unethical and can harm both parties involved. Instead, it is better to build mutually beneficial relationships based on trust and respect.