You know, they're obviously just trying to scare us to get us to rat out my dad.
他们这么做是为了吓唬我们，好让我们检举我爸爸。

——Gossip Girl

rat out: A rat is a tattletale or a snitch. To rat out someone is to snitch on others or tell on others.
出卖，告密，检举，揭发

Where I come from, you don't rat on your friends.
在我的老家，谁都不出卖朋友。

He was sold out by a traitor and arrested.
他被叛徒出卖，被捕了。

I know Lily cheated on the test, Should we rat her out ?
Lily考试作弊了。我们该不该揭发她？