castles in the sky

(redirected from Castle in the sky)
Also found in: Financial, Wikipedia.
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castles in the sky

Dreams, hopes, or plans that are impossible, unrealistic, or have very little chance of succeeding. He keeps talking about how he'll move to Los Angeles to be a famous actor, but it's just castles in the sky if you ask me. You need sound financial advice and a strong plan if you're going to start your own business—it can't be all castles in the sky.
See also: castle, sky