( informal ) used to emphasize sth and to show that you are surprised or annoyed :
What in the world did they think they were doing?
( informal ) used to emphasize sth and to show that you are surprised or annoyed :
What in the world did they think they were doing?
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005