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View synonyms for castle in the air

castle in the air

noun

  1. a fanciful or impractical notion or hope; daydream.

castle in the air

noun

  1. a hope or desire unlikely to be realized; daydream
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of castle in the air1

First recorded in 1570–80

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Castle Howardcastle nut

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