not (one's) department

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not (one's) department

Not one's area of expertise or responsibility. I can't approve expense reports—that's not my department. Car repair isn't really Jim's department, but I'll take a look at the engine if you like.
See also: department, not

not your department

If a task or area of knowledge is not your department, you are not responsible for it or do not know much about it. The political issues are something else, but that's not really my department. `If you identify him, then what?' — `Not my department.' Note: You can also say that something is your department if you are responsible for it or know a lot about it. `So what do we do with him?' Admiral Polaski asked. `That, gentlemen, is our department,' Rintner said. Bill spoke expertly. This had been his department.
See also: department, not
References in periodicals archive ?
In the case of Northumberland, Mr Twigg says it is the county council which has been responsible for setting the 10pc limit on excess desks, not his department, and suggests closures are not the only solution to solve the surplus place problem.
But in a letter to Alan Beith, the Berwick MP, about Northumberland's plans to cut empty places, Mr Twigg said it was the council that had been responsible for setting the 10 per cent target and not his department.