1. I accidentally walked in on them while they were arguing.
我不小心撞见他们正在争吵。
2. Don't walk in on him while he is changing.
在他换衣服时不要突然闯进去。
3. She walked in on her parents having a private conversation.
她撞见父母正在进行私下谈话。

A: I am so embarrassed because I walked in on you in the bathroom.
A：我太尴尬了，因为我刚才撞见你在洗手间。

B: Oh no! Please close the door immediately!
B：噢不！请立刻关上门！

1) 撞见（某人正在做私事）

2) 突然闯入

1. 撞见（某人正在做某事）

e.g. We walked in on them while they were eating.
我们撞见他们正在吃饭。

verb phrase

1. To enter a room or a situation unexpectedly, often when someone is doing something private or embarrassing.

Synonym: interrupt, stumble upon