“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”。
- 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.
