delusion

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labor under the delusion of/that

To live, operate, or function with the unyielding belief in something, especially that which is fanciful, unrealistic, or untrue. Primarily heard in US. Jeremy's always labored under the delusion of being a great writer, even though he's never written more than a few crummy poems. No one likes paying taxes, but those who would call for them to be done away with altogether are laboring under the delusion that our society can function without them!
See also: delusion, labor, of, that

delusions of grandeur

Unrealistic beliefs about the amount of power and influence one has. You're just an intern, so you definitely have delusions of grandeur if you think the boss is going to listen to you!
See also: delusion, of

delusions of grandeur

a false impression of your own importance.
This expression is the equivalent of the French phrase folie de grandeur , which came into English in the late 19th century and is still used today.
See also: delusion, of

delusions of ˈgrandeur

(often humorous) a belief that you are more important than you really are: He’s been suffering from delusions of grandeur ever since he became manager.
See also: delusion, of
References in classic literature ?
On this question of the study of delusions, the practical effect of the modern theories, as Dr.
This impalpable claim, therefore, resulted in nothing more solid than to cherish, from generation to generation, an absurd delusion of family importance, which all along characterized the Pyncheons.
For a very long period after the witchcraft delusion, however, the Maules had continued to inhabit the town where their progenitor had suffered so unjust a death.
These ladies remain ladies to you, and to themselves, and to everybody else; and at the same time they will suffer in no way from my delusion, for when I know that an ostensible hog is a lady, that is enough for me, I know how to treat her.
Making all allowance for the follies that men committed every day in their relations with women, Montbarry's delusion was still the most monstrous delusion on record.
I do not stop to inquire whether we are both the victims of a delusion, or whether we are the chosen recipients of a supernatural communication.
If she is really the victim of a mental delusion, the poor creature is surely an object of compassion, and she ought to be placed under proper care.
Can any temptation have sophistry and delusion strong enough to persuade you to so simple a bargain?
Two or three nights after the arrival of the second package of letters, the Major had passed the evening pretty cheerfully at Lady O'Dowd's house, where Glorvina thought that he listened with rather more attention than usual to the Meeting of the Wathers, the Minsthrel Boy, and one or two other specimens of song with which she favoured him (the truth is, he was no more listening to Glorvina than to the howling of the jackals in the moonlight outside, and the delusion was hers as usual), and having played his game at chess with her (cribbage with the surgeon was Lady O'Dowd's favourite evening pastime), Major Dobbin took leave of the Colonel's family at his usual hour and retired to his own house.
But for Alexey Alexandrovitch it was a necessity to think in that way; it was such a necessity for him in his humiliation to have some elevated standpoint, however imaginary, from which, looked down upon by all, he could look down on others, that he clung, as to his one salvation, to his delusion of salvation.
It is my conviction, or my delusion, no matter which, that crime brings its own fatality with it.
With the partial recovery of his animation came the return of his wonderful delusion on the subject of swimming.
The delusion was so strong upon him, and was so full of that vague terror of the night in which such visions have their being, that he rose, and taking his sheathed sword in his hand, opened the door, and looked out upon the staircase, and towards the spot where Hugh had lain asleep; and even spoke to him by name.
Pleasant sheds tears deserving her own name, and her sweet delusion is at its height.
Because it would destroy all the delusion, and take away all the interest, wouldn't it?