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
U-Jin	oo-jeen	Korean
ÁBel	AH-bel	Hungarian
Aoede	-	Greek Mythology (Latinized)
Ludis	-	Latvian
Terry	['teri]
Lorita	-	Italian