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castle in the air

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

Origin of castle in the air

First recorded in 1570–80
Also called air castle, castle in Spain.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for air castle

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 air castle

castle in the air

castle in Spain

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