bailiwick

noun

1. the district within which a bailie or bailiff has jurisdiction.
2. a person’s area of skill, knowledge, authority, or work: to confine suggestions to one’s own bailiwick.

noun

1. law the area over which a bailiff has jurisdiction
2. a person’s special field of interest, authority, or skill

n.

“district of a bailiff,” early 15c., baillifwik, from bailiff (q.v.) + Middle English form of Old English wic “village” (see wick (n.2)). Figurative sense of “one’s natural or proper sphere” is first recorded 1843.