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.

Definition of cone of silence in:

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Word of the day impudicity
Pronunciation: ˌɪmpjʊˈdɪsɪti
noun
lack of modesty