be out of (one's) depth

To be in a field or situation that exceeds one's knowledge or ability. Of course she's out of her depth with 25 employees reporting to her—she had hardly any supervisory experience before you gave her the job! I asked Alex to consult on this project because it's a bit out of my depth.

Common Names:

Name	Pronounced	Usage
Frits	FRITS	Dutch
Beatrix	BE-ah-triks (German), BAY-ah-triks (Dutch), BEE-ə-triks (English)	German, Hungarian, Dutch, English (Rare), Late Roman
SÉRaphine	se-ra-FEEN	French
Peace	PEES	English (Rare)
Waldo	WAWL-do (English)	English, German, Ancient Germanic
Jekaterina	ye-kah-tye-REE-nah, ee-kah-tee-REE-nah	Russian