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
Clotho	-	Greek Mythology (Latinized)
Hrodebert	-	Ancient Germanic
Leofstan	-	Anglo-Saxon
Gitta	GI-tah	German
Selene	[si'li:ni]
BogumiŁ	baw-GUW-meew	Polish