(radio) A hypothetical device or instrument which prevents eavesdropping on a private conversation.

plural of cone of silence

A respectful ritual in which normal activity ceases and people stand in silent meditation for two minutes; held regularly on Armistice Day, Remembrance Day, and on other occasions, to remember the dead.

plural of two-minute silence

(idiomatic) Strict secretiveness maintained by the members of a police force with respect to information which might be contrary to their interests, especially information concerning questionable police actions.

Synonym of blue wall of silence

plural of blue code of silence

plural of blue wall of silence

plural of argument from silence

An argument based on the absence of something being mentioned in documents as evidence.