WordReference Random House Unabridged Dictionary of American English © 2025
cas′tle in the air′, 
  1. a fanciful or impractical notion or hope;
    daydream. Also called air castle, cas′tle in Spain′. 
  • 1570–80

Collins Concise English Dictionary © HarperCollins Publishers::
castle in the air, castle in Spain
  1. a hope or desire unlikely to be realized; daydream
'castle in the air' also found in these entries (note: many are not synonyms or translations):
air castle

Forum discussions with the word(s) "castle in the air" in the title:


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