out of your depth
US /aʊt əv jʊər dɛpθ/
UK /aʊt əv jʊər dɛpθ/

1.
di luar kemampuan, tidak sanggup
in a situation that is too difficult for you to understand or deal with
:
•
I felt completely out of my depth in the advanced physics class.
Saya merasa benar-benar di luar kemampuan saya di kelas fisika tingkat lanjut.
•
He's a good manager, but he's out of his depth when it comes to international finance.
Dia manajer yang baik, tapi dia di luar kemampuannya dalam hal keuangan internasional.