( informal ) used to show that sth is hard for sb else to imagine :
You've no idea how much traffic there was tonight.
( informal ) used to show that sth is hard for sb else to imagine :
You've no idea how much traffic there was tonight.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005