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English definition of “trooper”

trooper

noun [C] uk   /ˈtruː.pər/ us    /-pɚ/

trooper noun [C] (SOLDIER)

a soldier who belongs to the lowest rank in the part of an army that fights in strong military vehicles or on horses

trooper noun [C] (POLICE OFFICER)

US a police officer in one of the forces of the 50 states of the US: state troopers Troopers are called out in emergencies or dangerous situations.
(Definition of trooper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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