v. phr. To make impossible or imaginary plans, dream about future successes that are unlikely. He liked to build castles in the air, but never succeeded in anything. To build castles in Spain is natural for young people and they may work hard enough to get part of their wishes.
BUILD CASTLES IN THE AIR
Meaning of BUILD CASTLES IN THE AIR in English
American idioms English vocabulary. Английский словарь американских идиом. 2012