The antonyms for the phrase "came out on top" can vary based on the context in which it is used. In one scenario, the opposite could be "came out at the bottom" or "lost". In another situation, it could mean "didn't make the cut" or "fell short". Other antonyms could include "failed", "underperformed", "fell behind", or "struggled". It all depends on the context and the desired meaning. Nevertheless, all these antonyms indicate losing, performing inadequately, or failing to achieve a particular goal.