A person who travels on horseback; a rider or horse courier, especially in historical contexts.
From course or 'corser' related to traverse a course on horseback. The term appears in Middle English and likely derives from the practice of riding courses or routes, similar to 'courser' (a war horse), though corser specifically refers to the person doing the riding.
Before railroads and automobiles, corsers were the actual 'information superhighway'—they delivered news, letters, and orders across countries, making them essential to medieval and early modern governments and commerce.
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