noun
[noncount] an animal that is hunted or killed by another animal for food
someone who is easily harmed or affected in a bad way by someone or something :victim
be/fall prey to
to be killed by (an animal, disease, etc.)
to be harmed or affected in a bad way by (someone or something)
verb
preys; preyed; preying
prey on/upon
[phrasal verb]
prey on/upon (something) :to hunt and kill (something) for food
prey on/upon (someone) :to hurt, cheat, or steal from (someone)
prey on/upon someone's mind :to make someone worry :to be constantly on someone's mind