Be somebody’s department
phrase
To be someone's area of knowledge, responsibility, or expertise.
Anna is our marketing expert. If you have any questions about the new ad campaign, that's her department.

Often appears as...
- that's not my department
- it's her department
Usage tips
Idiomatic
phrase
To be someone's area of knowledge, responsibility, or expertise.
Anna is our marketing expert. If you have any questions about the new ad campaign, that's her department.

Often appears as...
- that's not my department
- it's her department
Usage tips
Idiomatic
Definition 1 of 1

Responsibility Hint
Suggests who should handle a task without giving direct orders.

You're good with numbers, so this budget report is your department.
Expertise Indicator
Implies someone has special skills or knowledge in an area.

Talk to Rachel about the problem, it's her department.
Polite Refusal
A way to decline tasks that are outside one's role in a polite manner.

I don't handle client accounts, that's not my department.
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