to  be  one's department
be
bi
bi
<i>one's</i>
wʌnz
vanz
department
dɪpɑ:tmənt
dipaatmēnt

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 

Examples
Isn't handling customer inquiries your department, Chris? 
02

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

Examples
I can look into it, but legal matters are not exactly my department. 
LanGeek
Download LanGeek app
langeek application

Download Mobile App

App Store