( informal ) to start or be made to start a new and difficult activity that you are not prepared for :
Junior hospital doctors are thrown in at the deep end in their first jobs.
( informal ) to start or be made to start a new and difficult activity that you are not prepared for :
Junior hospital doctors are thrown in at the deep end in their first jobs.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005