The phrase "gotten better of" implies that one has gained an advantage over someone or something else. Antonyms for this phrase could include "yielded to," "succumbed to," or "given in to," indicating that someone or something has been defeated or overtaken. Other possible antonyms could include "fallen behind," "lagged behind," or "been left behind," suggesting a lack of progress or success. In contrast, antonyms for "gotten better of" might also include "shared with," "compromised with," or "negotiated with," reflecting a spirit of cooperation and mutual benefit rather than competition or domination. Ultimately, the right antonym will depend on the specific context and meaning of the phrase.