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to throw somebody in (at) the deep end
01
ввести кого-то в новую ситуацию, работу и т.д. Без подготовки или представления
to put someone in a difficult or challenging situation without providing any help or guidance
Пример
I decided to take the plunge and sign up for an advanced language course, knowing it would throw me in at the deep end, but I was eager to challenge myself.
I had never worked in sales before, but my boss threw me in at the deep end, and I learned quickly.
When I started my new job, they threw me in at the deep end by assigning me a major project on my first day.