to talk shop (to talk about work or business outside the office)

E.g. 1:

A: I’m really worried about the meeting on Monday morning. Do you think the management team will be angry about the sales figures?

B: Stop talking shop! We came to this party to relax and to forget about work!

A: Yeah, sorry. I just can’t stop worrying about it.

E.g. 2:

A: I really don’t like going out for a drink with people from the office. After a few minutes, everyone starts talking shop.

B: Well, I think that’s normal when you go out with work colleagues.

A: I know. But I wish people could stop talking shop and talk about other things, like holidays or movies!