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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

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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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
Farlex Partner Idioms Dictionary © Farlex 2017

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
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
The most striking finding was how heavily age-dependent delusional infestation was.
L, it was initially estimated that it would take at least 2 weeks for the delusional parasitosis to significantly respond to antipsychotic therapy.
Charles' new patient and the thought that she herself would also be looking after the delusional and aggressive young adult.
In some cases, delusional conviction occurs with no clear division between delusional and nondelusional thinking.
(1) The second sister probably escaped the delusional disorder as she was educated, had friends, and married.
Quante, "Comparative efficacy and acceptability of existing pharmacotherapies for delusional disorder: a retrospective case series and review of the literature," Journal of Clinical Psychopharmacology, vol.
Here, the author discusses temporality distortion, which may be considered, per se, the condition of a different psychotic state, different from the hallucinatory and disorganized delusional state.
He developed a sudden delusional idea of being persecuted by the then Ruling Party.
He must be a delusional megalomaniac to attack in his statement Republican front-runner Donald Trump for "preying on people's prejudices and fears".
The Syrian saleswoman, who medical reports confirmed suffers from a delusional disorder, was said to have visited her Moldovan co-worker at their workplace to discuss marriage.
The book begins with a theoretical review of the research on reasoning bias in delusional thinking.
"When the adherents to these world religions realize their leaders have been deceiving them, when money fails and when humanity tires of the war and deception, the delusional religious rhetoric of our day will pass giving way to caring, sharing and love for all as the world joins hands in the one community we truly are," Mark explains.
When other causes of infectious dysesthesias --such as scabies, cercarial dermatitis, and cutaneous larva migrans--are excluded by physical examination or skin biopsy, and no treatable dermatoses are diagnosed, this condition is called delusional infestation, formerly delusional parasitosis.
LIB-Dem councillors and MPs must be delusional if they think a change in leadership is all their party needs to get back on track in politics!