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3. silent as the dead

silent as the dead

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*silent as the dead

 and *silent as the grave

completely silent. (Has ominous connotations because of the reference to death. Usually used to promise someone that you will be silent and therefore not betray a secret. *Also: as ~.) I knew something was wrong as soon as I entered the classroom; everyone was silent as the dead. Jessica is as silent as the grave on the subject of her first marriage. If you tell me what Katy said about me, I promise to be as silent as the grave.

See also: dead, silent