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castle in the air

also castle in Spain
: a dream, plan, or idea that can never become real空中楼阁;白日梦usually plural通常用复数
⇒ Main Entry: castle

castle in the air

noun phrase

variants or less commonly castle in Spain
: an impracticable project : daydream

Word History

First Known Use

1566, in the meaning defined above

Time Traveler
The first known use of castle in the air was in 1566

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