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
Israel	IZ-ray-əl (English), IZ-ree-əl (English)	Jewish, English, Biblical, Biblical Greek
Rhodri	-	Welsh
Terry (2)	TER-ee	English
Dev	-	Indian, Hindi, Marathi
Filimena	-	Macedonian
Kolya	-	Russian