The craft, skill, or business of manufacturing and building carts.
From cartmaker combined with the gerund suffix -ing, creating a noun that describes the activity or craft itself. This follows English patterns of converting agent nouns into process nouns.
Cartmaking was a specialized trade that required knowledge of wood selection, wheel construction, axle engineering, and load distribution—it was literally the mechanical engineering of the medieval world, and a poorly made cart could be dangerous.
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