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English definition of “labour under the delusion, illusion, misapprehension, etc.”

labour under the delusion, illusion, misapprehension, etc.

to wrongly believe that something is true: At the time I was still labouring under the delusion that the project might be a success.
(Definition of labour under the delusion, illusion, misapprehension, etc. from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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