pipe dream

US /ˈpaɪp ˌdrim/
UK /ˈpaɪp ˌdrim/
"pipe dream" picture
1.

mrzonka, złudzenie

an unrealistic hope or fantasy

:
His plan to become a millionaire overnight is just a pipe dream.
Jego plan, by z dnia na dzień zostać milionerem, to tylko mrzonka.
Getting a promotion without working hard is a pipe dream.
Awans bez ciężkiej pracy to mrzonka.