“守口如瓶”，是一个汉语成语，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“seal one's lips”，或“ be tight-mouthed”。
- 他对她的身份守口如瓶。
He closely guarded her identity. - 无论出什么事，他都会守口如瓶。
No matter what happened, he would not say a word. - 约翰有意说出来，但玛丽要他守口如瓶。
John wanted to talk, but Mary told him to keep his lips buttoned.
