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. I'm under no illusion that my kids are angels, but I never expected them to lie to my face about sneaking out. You can't dupe me this time—I'm under no illusions about what a duplicitous snake you are!
be under the illusion that
To be living, operating, or functioning based on a belief that 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. I'm not under the illusion that my kids are angels, but I never expected them to lie to my face about sneaking out.
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!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.