used in negative sentences to say that a situation is worse or more complicated than sb thinks :
'It sounds very difficult.' ' You don't know the half of it .'
used in negative sentences to say that a situation is worse or more complicated than sb thinks :
'It sounds very difficult.' ' You don't know the half of it .'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005