to be in a situation where you will either succeed by your own efforts or fail completely :
The new students were just left to sink or swim.
to be in a situation where you will either succeed by your own efforts or fail completely :
The new students were just left to sink or swim.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005