used to show that you are giving more detailed and accurate information about sth you have just mentioned :
The problem is due to discipline, or, more precisely, the lack of discipline, in schools.
used to show that you are giving more detailed and accurate information about sth you have just mentioned :
The problem is due to discipline, or, more precisely, the lack of discipline, in schools.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005