Definition of bailiwick noun from the Oxford Advanced American Dictionary

 

bailiwick

 noun
noun
NAmE//ˈbeɪliˌwɪk//
 
, NAmE//ˈbeɪləˌwɪk//
 
(formal)
 
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someone's particular area of responsibility or interest He never writes up our reports—that's my bailiwick.
See the Oxford Advanced Learner's Dictionary entry: bailiwick