feed on something

Từ điển Oxford Advanced Learner 8th

ˈfeed on/off sth derived
1. (of an animal)to eat sth
•Butterflies feed on the flowers of garden plants.
2. (often disapproving)to become stronger because of sth else
•Racism feeds on fear.
•He feeds off the work and reputation of others.
Main entry: ↑feed_derived