sucker for someone or something

a sucker for (someone or something)

Someone who tends to be easily attracted to a particular type of person or thing. What can I say—I'm a sucker for romantic comedies! I've always been a sucker for a guy with a six pack.
See also: sucker

sucker for someone or something

n. someone who is prejudiced in favor of someone or something. Ted is a sucker for any dessert with whipped cream on it.