道听途说

dàotīng-túshuō

[hearsay; what is spoken and heard in the street; pick up what has been heard on the way] 路上听来的消息。 指没有根据的传闻

小说家者流, 盖出于稗官, 街谈巷语, 道听途说者之所造也。 --《汉书·艺文志》