bailiwick

小説 "Before I Say Good-Bye" からの引用です。
"The boat that blew up near the Statue of Liberty is in his bailiwick, although during this interview he must have been visiting the home of one of the apparent victims, out in Queens.
" 早速事故（事件？）が起こりました。さてここに出てきた "bailiwick" の意味を調べます。
・Oxford English Dictionary: One's sphere of operations or particular area of interest.: You never give the presentations--that's my bailiwick.
・Merriam-Webster's Online Dictionary: the sphere in which one has superior knowledge or authority: Questions about organization of the fund drive are my bailiwick.
縄張りウィックと覚えよう。