( informal ) used to reply to a statement that you find interesting or surprising, or that you do not believe :
'She says I'm one of the best students she's ever taught.' 'Is that a fact?'
( informal ) used to reply to a statement that you find interesting or surprising, or that you do not believe :
'She says I'm one of the best students she's ever taught.' 'Is that a fact?'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005