sky marshal

noun

an armed plainclothes federal marshal riding on an airliner to protect against skyjacking.

Origin of sky marshal

An Americanism dating back to 1965–70

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for sky marshal

sky marshal

noun

an armed security guard on a commercial aircraft

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012