sky marshal

noun
🔊/ˈskaɪ mɑːʃl/
🔊/ˈskaɪ mɑːrʃl/
(also air marshal)
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  1. an armed guard, especially a government official, who travels on a plane with the passengers in order to protect the plane from terrorists空中反恐武装警卫Topics Transport by airc2