换个话题

change the subject

→ 换
phrase Rare #25,810
change the subject Used to suggest moving the conversation to a different topic. 个 is a measure word used here with the meaning “another” or “a different.”
CH: 我们换个话题聊吧。
EN: Let’s talk about something else.

我们换个话题

Let's change the subject.

— 睁开你的双眼 (1997)

换个话题好不好

Can we change the subject?

— 妈咪 (2014)

换个话题

Let's change the subject.

— 东京物语 (1953)

玛蒂尔达换个话题

Matilda, let's change the subject.

— 这个杀手不太冷 (1994)