to be one's department

Definition & Meaning of "be one's department"in English

to be one's department
01

to be responsible for something, showing a sense of authority in that area

example
Examples
Is n't handling customer inquiries your department, Chris?
Coordinating project timelines is Alex's department in the project management team.
02

to know a lot about something, indicating a sense of expertise in the matter

example
Examples
I can look into it, but legal matters are not exactly my department.
I'll do my best, but graphic design is n't really my department.
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