Real Dictionary

prey
A creature's prey are the creatures that it hunts and eats in order to live.
If someone is prey to something bad, they have a tendency to let themselves be affected by it.
You can refer to the people who someone tries to harm or trick as their prey.
verb: A creature that preys on other creatures lives by catching and eating them.
verb: If someone preys on other people, especially people who are unable to protect themselves, they take advantage of them or harm them in some way.
verb: If something preys on your mind, you cannot stop thinking and worrying about it.

prey in American English
plunder; booty
intransitive verb: to seize and devour prey, as an animal does
noun: an animal hunted or seized for food, esp. by a carnivorous animal

prey in British English
noun: an animal hunted or captured by another for food