be (one's) pigeon

To be one's area of expertise or responsibility. Primarily heard in UK, Australia. I can't approve expense reports, but Betty can—that's her pigeon.

Name	Pronounced	Usage
Roselle	-	French (Rare)
Earle	URL	English
Rahman	-	Arabic, Persian, Indonesian, Malay
Barry	BAR-ee, BER-ee	Irish, English
Roscoe	RAHS-ko	English
Vugar	-	Azerbaijani