English version

castles in the air

From Longman Dictionary of Contemporary Englishcastles in the aircastles in the airBELIEVEplans or hopes that you have that are unlikely ever to become real castle
Examples from the Corpus
castles in the airThat, says McKinsey, is because they spend money where it is needed rather than on grand castles in the air.Hugh Bawn's high-tech castles in the air.
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