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- DictionaryCone of si·lence
noun
- 1. an imaginary device that prevents eavesdropping on a private conversation.
- 2. a directive that prohibits oral communication about a specified subject.
noun
Secrecy trope in 60s U.S. sitcom
The Cone of Silence is one of many recurring joke devices from Get Smart, a 1960s American comedy television series about an inept spy. The essence of the joke is that the apparatus, designed for secret conversations, makes it impossible for those inside the device – and easy for those outside the device – to hear the conversation. Wikipedia