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sky marshal

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noun
  1. an armed plainclothes federal marshal riding on an airliner to protect against skyjacking.
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Origin of sky marshal

An Americanism dating back to 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sky marshal

sky marshal

noun
  1. an armed security guard on a commercial aircraft
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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