( informal ) used to tell sb how they should behave, especially when they have been behaving in a way you do not like :
You're a suspect, not a detective, and don't you forget it.
( informal ) used to tell sb how they should behave, especially when they have been behaving in a way you do not like :
You're a suspect, not a detective, and don't you forget it.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005