labor under a delusion/misapprehension/misconception
idiom
: to continue to believe something that is not true
He still labors under the delusion that other people value his opinion.
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“Labor under a delusion/misapprehension/misconception.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/labor%20under%20a%20delusion%2Fmisapprehension%2Fmisconception. Accessed 22 Jul. 2025.
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