Meaning of the word "be someone's department" in English

What does "be someone's department" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be someone's department

US /biː ˈsʌm.wʌnz dɪˈpɑːrt.mənt/
UK /biː ˈsʌm.wʌnz dɪˈpɑːrt.mənt/
"be someone's department" picture

Idiom

1.

to be someone's responsibility or area of expertise

Example:
I can't help you with that; it's not my department.
Handling customer complaints is her department.
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