be in a dream world

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be in a dream world

To have unrealistic expectations or an unrealistic view of the world, often one that is more beneficial or positive for oneself than is the case. You're in a dream world if you think I'm buying you a brand-new car for your birthday. With her grades, there's no way she's getting into Harvard—she's in a dream world.
See also: dream, world

be/live in a dream world

to have ideas or hopes which are not practical and are not likely to be successful (usually in continuous tenses) If she thinks he's suddenly going to turn into the perfect boyfriend, she's living in a dream world.
See also: dream, world