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Meaning of 'Castles in the air'

What does the saying 'Castles in the air' mean?

Idiom: Castles in the air

Meaning:

Plans that are impractical and will never work out are castles in the air.
Country: International English | Subject Area: Buildings & construction | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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