be (not) (one's) department

To be one's area of expertise or responsibility. I can't approve expense reports—that's not my department. Car repair is my dad's department, so he should be able to help you out.

Common Names:

Name	Pronounced	Usage
Feruza	-	Uzbek
Margaret	['ma:gərit]
Vlad	VLAHT (Russian)	Russian, Romanian, Medieval Slavic
Kiyoshi	kee-yo-shee	Japanese
Alexandros	-	Greek, Ancient Greek, Biblical Greek, Greek Mythology
Krystelle	-	English (Rare)