“守口如瓶”，汉语成语，字面意思是“闭口不谈，像瓶口塞紧了一般（keep one's mouth shut as that of a jar）”。比喻说话谨慎，严守秘密，可以翻译为“ be tight-mouthed，button up one's mouth，或zip one's lip”。

例句：

他对她的身份守口如瓶。

He closely guarded her identity.

至于私底下告诉我的任何事情，我会守口如瓶的。

As for anything told to me in confidence, well, my lips are sealed.

无论出什么事，他都会守口如瓶。

No matter what happened, he would not say a word.