English version

be somebody’s department

From Longman Dictionary of Contemporary Englishbe somebody’s departmentbe somebody’s departmentspokenRESPONSIBLE if something is someone’s department, they are responsible for it or know a lot about it I’ll see what I can do, but it’s not really my department. department
Examples from the Corpus
be somebody’s departmentDon't ask me - cooking is John's department.
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