[throw] {sb} in (at|) the deep end
1
to put someone in a difficult or challenging situation without providing any help or guidance
- The manager threw her in at the deep end on her first day.
- He was thrown in the deep end when asked to lead the project.
- They often throw new hires in at the deep end to test their skills.
- The internship threw her in the deep end with complex assignments.
- He thrived after being thrown in at the deep end with little experience.