Antonyms for buying back include selling, disposing, relinquishing, surrendering, and abandoning. These terms connote the act of getting rid of something rather than retrieving or repurchasing it. Instead of buying something back, one would dispose of it when they no longer have a use for it. Selling something, on the other hand, involves exchanging it for money or something else of value. Relinquishing and surrendering refer to voluntarily giving up ownership or control of something, while abandoning implies a complete lack of concern or interest in something. Understanding these antonyms allows for clear communication and accurate understanding of actions and intentions related to ownership and possession.