Noun
rumor mill (plural rumor mills)
(American spelling, idiomatic) A process in which a group or network of persons originate or promulgate gossip and other unsubstantiated claims.
I'm frustrated by something, it's my fault for exposing myself to it in the first place. The rumor mill always seemed like a grass fire to me. Why walk out in the middle of the field, it's just going to flame out and go away just like everything else does? Amy Grant
Today, people can say anything they want. Suddenly it gets in the rumor mill and then it evolves and then somehow it becomes fact and you say, What is this You know, why don't you ask me. Tom Cruise