an impossibility
a dream or fantasy
something that is unlikely to happen
something that will not work
a hope, plan or idea that will most likely fail
when pigs fly
when hell freezes over
His plans of becoming an astronaut are a pipe dream, he should be more realistic.
She had wanted to be a ballet dancer when she grew up, but as she got older, she realised it was nothing but a pipe dream.
They had wanted to grow the business until it was large enough to employ 100 staff but that was turning into a pipe dream with the economy how it is.
As she bent her head to receive the gold medal, she realised competing for her country in the Olympics was no longer a pipe dream.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.