Meanings
The first term dates from the late 1500s. A variant, castles in Spain (or châteaux en Espagne), was recorded in the Roman de la Rose in the 13th century and translated into English around 1365.
How to pronounce "build castles in the air":
AU
To have any desire, idea, or plan that is unlikely to be realized; to imagine visionary projects or schemes; to have an idle fancy or a pipe dream; to daydream.
Example Sentences
1
I used to build castles in the air when it came to my future career.
2
She is known for her tendency to build castles in the air and never follow through.
3
They were warned not to build castles in the air and to consider the practicality of their ideas.
