- An unattainable or fanciful hope or scheme: free trade in international aviation will remain a pipe dreamMore example sentences
- We deserve a system where clean, sustainable energy is something more than a pipe dream for delusional hippies.
- If they stayed loyal to the ARL, super-league would have remained a pipe dream.
- So it would be a pipe dream to expect the council to grass it over (although that would look lovely).
late 19th century: referring to a dream experienced when smoking an opium pipe.