What is trooper meaning?

Trooper is a term used to refer to a member of a military unit, particularly a cavalry unit. It is also used to describe a police officer or a member of a paramilitary force. The term is derived from the old French word "troupier" meaning a member of a company or a troop. In modern usage, the term can also refer to a person who shows bravery or determination in difficult situations, "to be a real trooper".