prey on somebody

Từ điển Oxford Advanced Learner 8th

ˈprey on/upon sb/sth derived
1. (of an animal or a bird)to hunt and kill another animal for food
•Hawks prey on rodents and small birds.
2. to harm sb who is weaker than you, or make use of them in a dishonest way to get what you want
•Bogus social workers have been preying on old people living alone.
Main entry: ↑prey_derived