Definition of cone of silence in English:

cone of silence

Syllabification: cone of si·lence

Entry from US English dictionary

noun

  • 1An imaginary device that prevents eavesdropping on a private conversation.
  • 1.1An electronic device or isolated room intended for the same purpose.
  • 2A directive that prohibits oral communication about a specified subject.
  • 2.1An agreement or conspiracy to maintain secrecy about a subject.

Origin

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

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