A large, strong horse bred and used for pulling heavy carts and wagons, rather than for riding.
From 'cart' (wheeled vehicle) + 'horse,' describing the animal's primary purpose of hauling goods.
Carthorse breeds like the Shire and Clydesdale can weigh over a ton and pull loads weighing several tons, and they were so economically important that their bloodlines were carefully maintained and recorded for centuries.
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