where does the term dead ringer come from
Dead ringer (idiom) Dead ringer is an idiom in English. It means "an exact duplicate" and derives from 19th-century horse-racing slang for a horse presented "under a false name and pedigree"; "ringer" was a late nineteenth-century term for a duplicate, usually with implications of dishonesty, and "dead" in this case means "precise", as in "dead centre".[1]