From Longman Dictionary of Contemporary Englishfeed on something phrasal verb1 HBAEATif an animal feeds on a particular food, it usually eats that food Owls feed on mice and other small animals.2 INCREASE IN ACTIVITY, FEELINGS ETCif a feeling or process feeds on something, it becomes stronger because of it Prejudice feeds on ignorance. → feed→ See Verb table
Examples from the Corpus
feed on • Everything was feeding on everything else.• The hummingbird which feeds on it must therefore visit many plants, one after another.• When in the nineteenth century naturalists first examined it, they were mystified as to how any animal could feed on it.• A robin was still feeding on the few remaining black cherries; the chokecherries are long picked off.• Some species of birds have developed the ability to distinguish between model and mimic and will feed on the imposters. 