The antonyms for the word "buy sell" can vary based on the context. In a business setting, the antonym for "buy" is "sell," as buying represents the act of purchasing goods or services, whereas selling means to exchange goods or services for money. However, in a personal context, the antonym for "buy" could be "give away" or "donate," as someone may choose to give away their possessions instead of buying new ones. Similarly, the antonym for "sell" in a personal context could be "keep" or "retain," as someone may choose to keep their possessions rather than selling them. Overall, the antonyms for "buy sell" are contextual and depend on the situation in which they're used.