run away with the notion

run away with the notion

To take a fantastical or unrealistic idea as something that is definitely true or destined to happen. His book appeared on a local bestseller list, and now he's run away with the notion of being a famous author. Local tabloids are running away with the notion of the mayor being a part of a big conspiracy.See also: away, notion, run

run aˈway with the idea/notion

(spoken) believe something that is not true: Don’t run away with the idea that you’re going to be famous just because you’ve appeared on television once.See also: away, idea, notion, run