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
Menuha	-	Hebrew
Lucy	LOO-see	English
Natalio	nah-TAH-lyo	Spanish
Homer	HO-mər (English)	English, Ancient Greek (Anglicized)
Vasu	-	Hinduism, Indian, Kannada, Malayalam, Telugu, Tamil, Hindi
Maxima	-	Ancient Roman