Word forms: troopers
1. countable noun & title noun A trooper is a soldier of low rank in the cavalry or in an armoured regiment in the army. ⇒ ...a trooper from the 7th Cavalry. ⇒ 'Where to, Corporal?' asked Trooper Fane respectfully. 2. countable noun In the United States, a trooper is a police officer in a state police force. ⇒ Once long ago he had considered becoming a state trooper.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers