Trooper

·add. ·noun A mounted policeman.

II. Trooper ·noun A soldier in a body of cavalry; a cavalryman; also, the horse of a cavalryman.

trooper
You will die the death of a trooper's horse, that is, with your shoes-on; a jocular method of tellin...

Dictionary of The Vulgar Tongue by Francis Grose
trooper
n. a mounted policeman. The use istransferred from the name for a private soldier in a cavalryregim...

Dictionary of Australasian Words Phrases and Usages by Edward E. Morris