keep one's mouth shut as that of a jar;be as close as an oyster;be as silent as the grave;be buttoned up;keep one's mouth shut ;

They obey the one unwritten rule that binds them all—no talking.
他们都遵守着那条约束他们所有人的默认规则——要守口如瓶。
来源:《柯林斯高阶英汉双解学习词典》As for anything told to me in confidence, well, my lips are sealed.
至于私底下告诉我的任何事情,我会守口如瓶的。
来源:《柯林斯高阶英汉双解学习词典》If I tell you the secret, will you hold your cards close to your chest?
如果我告诉你这个秘密,你能守口如瓶吗?
来源:互联网摘选She was bursting to announce the news but was sworn to secrecy.
她急不可待想宣布这个消息,但却发过誓要守口如瓶。
来源:《柯林斯高阶英汉双解学习词典》军官们对于什么时候以及是否发动地面进攻依然守口如瓶。
来源:《柯林斯高阶英汉双解学习词典》
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