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castle in the air

a fanciful or impractical notion or hope; daydream.
Also called air castle, castle in Spain.
Origin of castle in the air
1570-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for castle-in-the-air
Historical Examples
  • Often while the lamp burnt low, and a horse-bell jangled sadly, they laughed together in a castle-in-the-air.

    To Tell You the Truth Leonard Merrick
British Dictionary definitions for castle-in-the-air

castle in the air

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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