to realize that sb/sth is not as good, pleasant, etc. as they/it seem
SEE SB/STH FOR WHAT THEY ARE / IT IS
Meaning of SEE SB/STH FOR WHAT THEY ARE / IT IS in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005