secretive

非常守口如瓶

极其守口如瓶

高度保密

Used to strongly emphasize the degree of secrecy, often in a more formal context.

用于强烈强调保密程度，常用于较正式的语境。

相当守口如瓶

Widely known for being secretive, usually with a negative connotation.

对…守口如瓶

Indicates the subject matter that is being kept secret.

指明被保密的主题。

守口如瓶

To have the quality of being secretive.

具有守口如瓶的品质。

变得守口如瓶

To start being secretive.

开始变得守口如瓶。