Where does “ploughhorse” come from?

ploughhorse (English) comes from English Plough, from Middle English plouh, from Old English plōh, from Old Frisian plōg, from Proto-Germanic plōgaz, from Proto-Celtic ɸlowyos, from Proto-Indo-European plówyos, from Proto-Indo-European plew- — to fly, flow, run.

ploughhorse (English): A horse who pulls a plough

Definitions

  1. A horse who pulls a plough

Ancestry of “ploughhorse”, step by step

ploughhorse traces back through two separate lines of ancestry.

via English Plough

StepLanguageWordMeaning
1EnglishPloughThe brightest seven stars of the constellation Ursa Major. They are Alkaid, Mizar, Alioth, Megrez, Dubhe, Merak, and Phecda
2Middle Englishplouh
3Old Englishplōhhide of land, ploughland
4Old Frisianplōgtroop, common interest
5Proto-Germanicplōgazplough
6Proto-Celticɸlowyosrudder
7Proto-Indo-Europeanplówyosship
8Proto-Indo-Europeanplew-to fly, flow, run

via English HORSE

StepLanguageWordMeaning
1EnglishHORSEA poker variant consisting of five different...
2Middle EnglishhorseAlternative form of hors; Alternative form of...
3Old Englishhorshorse
4Proto-West Germanichrosshorse
5Proto-Germanichrussąhorse
6Proto-Indo-Europeanḱers-to run
Every word from Proto-Indo-European plew-Every word from Proto-Indo-European plówyosEvery word from Proto-Celtic ɸlowyos