The phrase "goes bad" is often used to describe food that has spoiled or items that have become unusable. However, there are other ways to express this phenomenon. For instance, one could say that the item has gone rancid, deteriorated, spoiled, or expired. Other synonyms include turned, gone off, soured, rotted, perished, or degraded. The choice of words may depend on the context and the specific item being discussed. Regardless of the word choice, the implication is the same: the item can no longer be used as intended and may lead to potential health risks if consumed or used inappropriately.