Antonyms for the phrase "goes better" generally indicate that things are not progressing as expected or that there is a decline in performance. Some antonyms include "gets worse," "declines," "deteriorates," "regresses," "weakens," and "falters." These words all suggest a downward trend in performance or outcome. Other antonyms could include "stagnates," "plateaus," "stalls," and "slows down," which indicate that there is no improvement happening, but things are not necessarily getting worse either. It's important to remember that antonyms are contextual and dependent on the specific use of a word or phrase, so it's always best to consider the broader meaning and intention of the statement.