castle in the air


noun

a fanciful or impractical notion or hope; daydream.
Also called air castle, castle in Spain.

Origin of castle in the air

First recorded in 1570–80

Example sentences from the Web for air castle

  • 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

a hope or desire unlikely to be realized; daydream