Antonyms for "comes in first" can be phrases such as "comes in last," "loses," or "places second." These phrases all indicate a lower ranking or position than "comes in first." Other antonyms may include "fails to place," "finishes at the end of the pack," or "falls behind." These phrases are commonly used in competitive contexts, such as sports or races, where the goal is to achieve the highest possible ranking or position. In non-competitive contexts, antonyms for "comes in first" could include phrases such as "comes in last place" or "is not the leader," indicating a lesser level of achievement or success.