pipe dream

"If this is acceptable now, then it's not surprising that unionists will never want to be part of the pipe dream that is a united Ireland."

She explained exactly why the Golden Dome, which would supposedly protect the United States against nuclear attack, is a pipe dream:

Yeah, I know, it’s mostly a pipe dream, but there are those who are trying to keep that dream alive.

Even on good days, lunch breaks were often a pipe dream.

Defeated multiple times in the past, this bill would carve out an exception for small modular reactors, or SMRs, the current pipe dream of nuclear advocates.