trooper
noun [ C ] uk/ˈtruː.pər/ us/ˈtruː.pɚ/
(SOLDIER)
（军衔最低的）装甲兵，骑兵
a soldier who belongs to the lowest rank in the part of an army that fights in strong military vehicles or on horses
(POLICE OFFICER)
US（美国的）州警察
a police officer in one of the forces of the 50 states of the US
state troopers 州警察
Troopers are called out in emergencies or dangerous situations. 在紧急或危险的情况下可出动州警察。
Idiom
swear like a trooperidiom UK 破口大骂
to use a lot of offensive language
He was extremely drunk and swearing like a trooper. 他喝得酩酊大醉，嘴里骂个不停。