to go into a room and see what someone is doing, when they did not want to be seen
走进屋里撞见（某人在做私密的事）

例句：

I just don’t wanna walk in on you eating on the toilet again. 我只是不想下次又撞见你坐在马桶上吃东西了。

I don’t want Jenna to walk in on us. Jenna’s in the kitchen. 我可不想珍娜撞见我们这样珍娜在厨房。

She walked in on me when I was getting undressed. 她进屋正好撞见我在脱衣服。