pie-in-the-sky

The term 'pie-in-the-sky' is a 20th-century American English idiom, popularized by its use in the 1911 labor union song "The Preacher and the Slave" by Joe Hill. The song satirized the promises of religious salvation offered in lieu of material aid, with the lyric "You'll get pie in the sky when you die." The phrase literally evokes the image of an impossibly distant or unattainable reward—a pie existing only in the realm of the sky. Its logic is purely metaphorical, contrasting a tangible, desirable object (pie) with an impossible location (the sky) to create a powerful symbol for empty promises and wishful thinking. It has since become a standard expression for any impractical or utopian idea.

This is a fixed idiomatic phrase functioning as a compound adjective or noun. It is not productively segmented into independent morphemes for analysis in the traditional sense. The phrase is a metaphorical construction from English.