The phrase "a big fantasy" is correct and usable in written English.
It can be used to describe an idea, dream, or concept that is grand or unrealistic in nature.
Example: "Her plans for a lavish wedding in a castle were nothing more than a big fantasy."
Alternatives: "a grand illusion" or "a large dream".
QUESTION FROM PABLO : So, is this like a big fantasy for lots of women or something?
A big fantasy day from the rejuvenated tight end is expected.
He probably isn't ready to be a big fantasy contributor, but keeper leaguers should track his progress.
Do you think people have a big fantasy about Mountain Dew? "A fantasy?" About being on top of a mountain drinking it?
Performing in Ballet Theater, which he joined in 1997, was "kind of like a big fantasy, the place to be in".
There is no telling if Forte can manage a full workload and even if he does, the Seahawks' 12th-ranked run defense will make it tough for him to pull off a big fantasy performance.
The occasion for all this prepackaged Barkerophilia is the publication of a big, fantasy-laced novel with perhaps an even bigger selling point than the author himself: Hollywood.
Pretending that we should keep calm and carry on – that we even can – is a bigger fantasy than Santa Claus.
The history of Labour leaders demonised by the right wing press is not a pretty one, and the notion that Jeremy Corbyn could frame the rules of this war before he is annihilated may be a bigger fantasy than that of a Timelord defeating alien species with no more than the odd twist of his sonic screwdriver.
The idea of straight people watching Glee would make for a bigger fantasy than Avatar, and would require far more-expensive special effects.
After promoting "Valkyrie" internationally, he plans to take a short vacation, then look for "something big, fantasy or sci-fi".
