noun
absentminded dreaming while awake
• Syn:
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also castle in spainUsage: usually capitalized S
: a visionary project : daydream
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a fanciful or impractical notion or hope; daydream. Also called air castle, castle in Spain.
[1570-80]
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castle in the air,
something imagined but not likely to come true; daydream: »
They built castles in the air, and thought to do great wonders (Sir Thomas North).
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castle in the air (also castle in Spain)
— usually plural
He's just building castles in the air if he thinks he can open a restaurant without any money.
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Main Entry: ↑castle
Useful english dictionary. 2012.