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
Danny	DAN-ee	English
Yutke	-	Yiddish
Walganus	-	Arthurian Romance
Jeanette	zha-NET (French), jə-NET (English), shah-NET (Swedish)	French, English, Danish, Swedish, Norwegian, Dutch
Clarice	['klæris]
Adrastos	-	Greek Mythology