in over one's head

see under in deep, def. 2.

Name	Pronounced	Usage
Cecilie	se-SEEL-ye (Norwegian, Danish)	Norwegian, Danish, Czech
Huhana	-	Maori
Aikaterine	-	Greek, Ancient Greek
Corey	['kəʊri]
İLdar	-	Tatar
Alexandros	-	Greek, Ancient Greek, Biblical Greek, Greek Mythology