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
Rikki	RIK-ee	English (Modern)
Davy	DAY-vee	English
Racheal	RAY-chəl	English
ĐUraĐA	-	Serbian, Croatian (Archaic)
Aikman	['eikmən]
Kimbrough	['kimbrə]