The phrase "gotten upper hand" means to have gained control or dominance in a situation. Antonyms for this phrase would include "fallen behind" or "lost ground," which signify a loss of control or inferiority in a given scenario. Other antonyms could be "yielded," "surrendered," or "conceded," which suggest a relinquishment of power or the recognition of another person's dominance. To "give up" or "capitulate" would also be antonyms, indicating a submission or defeat. Overall, antonyms for "gotten upper hand" convey a sense of weakness or subservience, as opposed to the strength and control implied by the original phrase.