noun
matchmaker's story; saying nice things about a person
Refers to the exaggerated praise a matchmaker gives when introducing a potential marriage partner. Often used critically to imply that the description is too flattering or not entirely truthful.
仲人口を鵜呑みにしてはいけない。
You shouldn't take a matchmaker's story at face value.
彼女の話はまるで仲人口だ。
Her story sounds just like a matchmaker's exaggerated praise.