pipe dream

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

白日梦, 痴心妄想

an unrealistic hope or fantasy

:
His plan to become a millionaire overnight is just a pipe dream.
他一夜暴富的计划只是个白日梦
Getting a promotion without working hard is a pipe dream.
不努力工作就想升职是痴心妄想