An archaic or dialectal term, possibly for a corpse, skeleton, or the framework of something; a variant of 'carcass.'
Possibly a variant or folk etymology of 'carcass' from Old French 'carcasse,' or a Scottish/dialectal pronunciation. The exact origin is uncertain.
Old spellings of common words are like linguistic fossils—'corcass' shows us how people in different regions pronounced and spelled the same word, and some pronunciations won out while others disappeared!
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