( old-fashioned ) to have a sexual relationship with sb when you should not :
His wife found out he'd been carrying on with another woman.
( old-fashioned ) to have a sexual relationship with sb when you should not :
His wife found out he'd been carrying on with another woman.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005