a soldier of low rank in the part of an army that uses tanks or horses 坦克兵；骑兵 He was a cavalry trooper before being injured at the battle of Corunna. 在科伦纳战役中受伤之前，他是骑兵士兵。
- (also state trooper)(North American English)
(in the US) a member of a State police force （美国）州警察
Idioms
swear like a trooper
- (old-fashioned, British English)
to often use very rude or offensive language 满口脏话；动不动就破口大骂