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   cone of si·lence

   noun

   • 1. an imaginary device that prevents eavesdropping on a private conversation.
   • ▪ an electronic device or isolated room intended for the same purpose.
   • 2. a directive that prohibits oral communication about a specified subject.
   • ▪ an agreement or conspiracy to maintain secrecy about a subject.

   Word Origin 1960s: originally a fantasy prop in the television series Get Smart.

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