English version

labour under a delusion/misconception/misapprehension etc

From Longman Dictionary of Contemporary Englishlabour under a delusion/misconception/misapprehension etclabour under a delusion/misconception/misapprehension etcWRONG/INCORRECTto believe something that is not true She had laboured under the misconception that Bella liked her. labour
Examples from the Corpus
labour under a delusion/misconception/misapprehension etcWell, dear Rex was either lying or labouring under a misapprehension.
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