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to be one's department
01
to be responsible for something, showing a sense of authority in that area
Exemples
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
Exemples
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.
