top secret

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top secret

Of the utmost secrecy; not to be revealed to anyone, under any circumstances. Hyphenated if used as before a noun. It should go without saying that this information is top secret—do not mention it to anyone, not even your loved ones. The top-secret memo has been at the center of an ongoing controversy within the party over the past few months.
See also: secret, top
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

ˌtop ˈsecret

used to describe very secret government information: These defence plans are top secret, known only to a very few people.The file was marked TOP SECRET.
See also: secret, top
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
Kennedy hold top-secret -- meetings with advisers during the Cuban Missile Crisis?
The Soviets paid him pounds 38,000 for top-secret documents, including material on tactical nuclear weapons targeting the Soviet bloc and a handbook listing reconnaissance and intelligence-collection systems.
A top-secret team of "head hunters'' hired by Boddingtons eagerly conducted an undercover operation across the country.
Two pilots are given the sensitive job of flying a top-secret bomber during a war-games trial.
The massive operation contained in a 1056-page dossier is still classified as top-secret.
The show's creator, Matt Groening, promises there will be a top-secret special guest in the film, someone so top secret not even the McLaren F1 team know who it is.
A Navy officer was jailed yesterday for selling top-secret information to a newspaper about a feared Iraqi biological weapons attack on Britain.
BIG DAY: Jordan and Andy arrive at the top-secret venue Pictures: MATRIX
DOPE-smoking temps have been left in charge of some of Britain's most top-secret military documents, it was revealed last night.
DOPE-smoking temps have been left in charge of top-secret military documents, it was claimed last night.
Top-secret information on informers and their handlers was taken in the St Patrick's Day heist.
Whether you regard Edward Snowden as a sinner or a saint, you have to concede that something went awry when he was given top-secret clearance.
He described the US espionage operations as interference in Iran's internal affairs, and said, "This move is not acceptable at all." The British Guardian daily acquired top-secret documents about the US National Security Agency (NSA) datamining tool, called Boundless Informant, that details and even maps by country the voluminous amount of information it collects from computer and telephone networks.
PRISM works in conjunction with another top-secret program, called BLARNEY, which, according to the program's summary, "leverages IC [intelligence community] and commercial partnerships to gain access and exploit foreign intelligence obtained from global networks."