illusion

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labor under the illusion 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 illusion 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 illusion that our society can function without them!
See also: illusion, labor, of, that

be under no illusion

To know and understand the reality or truth of a situation. Don't worry, I'm not getting back together with Alex. After all his lies, I'm under no illusion about how he operates.
See also: illusion, no

be under the illusion that

To be living, operating, or functioning with the unyielding belief in something, especially that which is fanciful, unrealistic, or untrue. Jeremy's always been under the illusion that he's 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 under the illusion that our society can function without them!
See also: illusion, that

be under the illusion that

wrongly believe that.
1998 Independent The keening harmonies of the Brothers Gibb, a million naff dance routines by medallion men under the illusion that they were John Travolta.
See also: illusion, that

be under no illusion (or illusions)

be fully aware of the true state of affairs.
1992 Christian Scientist Monitor It is crucial to the nation's security…that we be under no illusions about reasons for this zero-loss rate.
See also: illusion, no
References in periodicals archive ?
For if representations are perceptual in this sense, they are neither illusional nor semiological; they are not objects we mistake for, for example, seated nudes--who could think that with a Cubist example before one?
It has to be stated nonetheless that their success was not borne out of being flower girls on Facebook and Snapchat, or being slay queens in the neighborhoods, or being illusional celebrities on Instagram.
Challenging the idea that "what people want is an anti-austerity party that is true to itself, its history and traditions," he warns that "the people who would bear the brunt of this illusional approach to politics are those same vulnerable people that I went into politics to serve.
Do we really want to sacrifice that for half remembered and half imagined dreams of an illusional imperial past as imagined by some Conservatives and UKIP?
In his third post he wrote, " Ram Rahim of MSG is a hybrid cross between an illusional Salman Khan, Rajnikant and a delusional Saint/ Satan and a very real a**.
AoYour foreign policies have been based on such illusional perceptions.
Swiftly rising flanks and sweeping lines combine to give it the very eager look of a flying wedge, although this is somewhat illusional.
Because large bodies of water can create an illusional effect, a submerged child might not be spotted from a certain angle, Berry said.
Shed the illusional pounds by wearing vertical stripes with a deep v- neck.
Children are invited to enjoy magic, puppets, music, books and storytelling, with lots of audience participation, all in one event, when Slightly Illusional presents "Set Sail
In any case, the lighter segment appears to have been painted with a single, masterful stroke of white, which the eye sees as going up and back, hence in the illusional space peculiar to pictures.