A fantastic, impracticable plan or desire
The trio finally called it a night with the likely hood of restful sleep a pipe dream.
As a mater of fact, she was starting to think that her idea of the right man was nothing more than a pipe dream.
The NHS is admittedly a huge organization and eliminating fraud completely, although desirable, can probably never be more than a pipe dream.
unseat Iraqi President Saddam Hussein is still a pipe dream.