castle in the air

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English[edit]

Noun[edit]

castle in the air (plural castles in the air)

  1. (idiomatic) A visionary project or scheme; a day-dream; an idle fancy; a pipe dream; any plan, desire, or idea that is unlikely to be ever realized; a near impossibility.

Usage notes[edit]

  • Completing the metaphor, one is said to build a castle in the air.

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