to start someone on a hard task without showing them how to do it
My first job was to organise a huge conference - they really threw me in at the deep end!
내 첫 번째 일은 대규모 컨퍼런스를 조직하는 것이었는데, 그들은 정말로 나를 깊은 곳에 던졌습니다!