The phrase "hit the high spots" refers to achieving success, making progress, or experiencing the best parts of something. Antonyms for this phrase could include "falling short," "missing the mark," "struggling," or "failing to measure up." These terms all suggest a lack of achievement or progress, indicating that someone or something has failed to reach the highest levels or goals. Other antonyms for "hit the high spots" might include "straying from the path," "settling for less," or "stagnating," which all suggest a lack of momentum or forward movement towards success. Regardless of the antonym used, the phrase "hit the high spots" implies a certain level of aspiration and ambition, making its opposite all the more disappointing.