a pipe dream

pipe dream

A dream or idea that is impossible to accomplish. Many say that achieving world peace is a pipe dream because human beings are so flawed in their logic and emotions.
See also: dream, pipe

a pipe dream

If you describe something that someone wants to do or happen as a pipe dream, you mean that it is not realistic and will probably not happen. Oh, Toddy, it's a pipe dream. The banks won't lend you that sort of money. He said the figures showed that a third runway at the airport remained a pipe dream. Note: This expression refers to the sort of idea that someone is likely to have when they are smoking a drug in a pipe.
See also: dream, pipe

a ˈpipe dream

a hope, belief, plan, etc. that will probably never come true: She’s got this pipe dream about being a pop star.This expression refers to smoking the drug opium, which makes you sleep and gives you powerful dreams.
See also: dream, pipe
References in periodicals archive ?
A pipe dream of size n is a filling of the staircase shape (n - 1, .
Starting with a k-north-east filling of [lambda], one obtains a pipe dream by replacing every 1 by two turning pipes and every 0 by two crossing pipes.
It's not a pipe dream, but a great development and urbanization of the City of Angels.