be under the illusion that(redirected from being under the illusion that)
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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
be under the illusion thatwrongly 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.
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