be department (redirected from department)

not be someone's department (informal)

if something is not your department, you are not responsible for dealing with it or you do not know much about it. As regards getting your computer fixed, you'll have to ask someone else - I'm afraid it's not my department. In general doctors don't know much about nutrition: that's not their department.

be someone's department

not be someone's department - if something is not your department, you are not responsible for dealing with it or you do not know much about it. I've chosen the paint and wallpaper, but the actual job of decorating is Neil's department.