in at the deep end

Derived from the slope in a swimming pool, which is shallow at one side, for beginners, and has a deeper section designed for more experienced swimmers.

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(thrown) in at the deep end (not comparable)

1. (idiomatic) Placed in a complex situation (especially work-related) without adequate preparation or experience.

• jump in at the deep end, take the bull by the horns

• throw in at the deep end
• off the wall