The phrase "hadst upper hand" implies a situation where one has control or advantage over another. Antonyms for this phrase could include "at a disadvantage," "outmatched," "outmaneuvered," or "outplayed." These terms suggest a scenario where one is struggling or losing, rather than in control. Other antonyms could include "defeated," "overpowered," "submissive," or "yielding." These words indicate a lack of control or agency, and a sense of being overpowered by another. Overall, the antonyms for "hadst upper hand" describe a range of scenarios in which one is not in control, but rather at the mercy of another force or player.