( informal ) used to tell sb to do sth now rather than later :
If the car needs cleaning, what are you waiting for?
( informal ) used to tell sb to do sth now rather than later :
If the car needs cleaning, what are you waiting for?
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005