drop it/the subject

to stop talking about something, especially because it is upsetting or annoying

别提了，不说了(尤指令人苦恼或烦扰之事)

I don't want to talk about it any more - let's drop the subject.

我不想再谈这件事了——我们不要再提它了。

A: Mummy, please can we go to the cinema tonight?

妈妈我们今天晚上能去电影院吗？

B: I've told you three times. No - we've got friends to dinner. Now drop it!

我都跟你说了三次了。不行，我们晚上要跟朋友吃晚饭。别再提了！

I've told you many times, now drop it!