"Become compost" is a phrase that refers to the process of transforming organic matter into nutrient-rich soil. There are several synonyms for this phrase, which can be used to add variety and interest to writing or conversation. Some examples include "decompose," "break down," "decay," "rot," or "biodegrade." These synonyms all convey a similar message about the natural process of transformation that occurs when organic matter is left to its own devices. Whether you're discussing gardening, ecology, or waste management, using these synonyms can help you communicate your ideas with clarity and precision.