- The definition of a trooper is a soldier, police officer or cavalry horse, or is slang for a person who is willing to participate in difficult situations.
- An example of a trooper is a cop who patrols the highways.
- An example of a trooper is a person who agrees to take on additional responsibility even though they have very little free time.
- an enlisted soldier in the mounted cavalry
- a cavalry horse
- a mounted police officer
- ☆ in the U.S., a state police officer
- Chiefly Brit. a troopship
- Informal trouper (sense )
Origin of troopertroop + -er
- a. A member of a unit of cavalry.b. A cavalry horse.
- a. A mounted police officer.b. A state police officer.
- also trouper A reliable, uncomplaining, often hard-working person.
Sense of cavalry soldier attested 1640, mounted policeman 1858 (Australia), state policeman 1911 (US). The sense of "one who endures adversity" comes from English trouper (“member of an acting troupe”), 1959, but through assimilation with the sense of "soldier" has come to be usually spelled "trooper".