be out of (someone's) depth

Übersetzungen
быть вне (чьей-либо) компетенции
He realized he was out of his depth when the conversation turned to advanced physics.
Он понял, что был вне своей компетенции, когда разговор перешел к продвинутой физике.
Definitionen
To be in a situation that is too difficult or complex for someone to understand or handle, often because it is beyond their knowledge, experience, or ability.