swear to secrecy

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释义
要求某人保密
To make one promise that they won't reveal something that they know about.

例句
Andy: Did they say where they were going?
Rocky: Look, I'm sorry. They swore me to secrecy. (True Blood)
安迪：他们有没有说要去哪里？
洛奇：抱歉，他们要我保密。（真爱如血）