( formal ) to believe sth that is not true :
to labour under a misapprehension / delusion, etc.
He's still labouring under the impression that he's written a great book.
( formal ) to believe sth that is not true :
to labour under a misapprehension / delusion, etc.
He's still labouring under the impression that he's written a great book.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005