build castles in the air

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build castles in the air

To create dreams, hopes, or plans that are impossible, unrealistic, or have very little chance of succeeding. You need sound financial advice and a strong plan if you're going to start your own business—don't just build castles in the air.
See also: air, build, castle

build castles in the air

 and build castles in Spain
Fig. to daydream; to make plans that can never come true. Ann spends most of her time building castles in Spain. I really like to sit on the porch in the evening, just building castles in the air.
See also: air, build, castle