There are several synonyms for the phrase "eat dirt" that convey a similar meaning. One colloquial term is "eat crow," which means to admit defeat or humiliation. Another similar phrase is to "swallow one's pride," which implies the act of accepting something unpleasant or unwanted. The slang term "bite the dust" can also be used in a similar context, suggesting a sense of failure or humiliation. "Humble pie" is another idiom that can be used in place of "eat dirt," emphasizing the act of acknowledging one's flaws or weaknesses. Overall, there are many ways to express the idea of experiencing an unpleasant loss or setback.