A flat-bottomed boat or barge with a projecting stern; a type of cargo vessel, especially one used on inland waterways.
From Middle English 'cog' (a type of ship from Old Norse 'koggi') + boat. Medieval cogs were seagoing vessels, but cogboat often referred to smaller riverine variants.
Medieval cog ships were so successful at transporting cargo that their name became genericized for any sturdy cargo boat, and you can still see cog reconstructions in maritime museums demonstrating why Vikings and Hanseatic traders loved these designs.
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