"Feed on" is a versatile phrase that can mean different things depending on the context. It can refer to an animal consuming food, a person being nourished by a particular food or idea, or a situation benefiting from a particular factor. Synonyms for "feed on" include "nourish," "consume," "thrive on," "take sustenance from," "gain sustenance from," "be sustained by," and "draw sustenance from." Each of these synonyms can be used to describe different situations and use cases for the phrase "feed on," allowing for a more varied and nuanced vocabulary.