Sky-marshal meaning

An armed federal law-enforcement officer, usually working undercover on an airliner during a flight, assigned to prevent or stop air piracy and acts of terrorism involving commercial aircraft.
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A federal officer assigned to guard against the hijacking of commercial airliners.
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(US, law enforcement) An armed, undercover guard on a commercial-airline flight.
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(fiction) A military rank in fiction for air force, space force, or armed forces, usually the topmost rank.
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