<Table> <Tr> <Td> </Td> <Td> This article relies largely or entirely on a single source . Relevant discussion may be found on the talk page . Please help improve this article by introducing citations to additional sources . (November 2016) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article relies largely or entirely on a single source . Relevant discussion may be found on the talk page . Please help improve this article by introducing citations to additional sources . (November 2016) </Td> </Tr> <P> 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". </P> <P> The term is sometimes implausibly said to derive, like "saved by the bell", from a custom of providing a cord in coffins for someone who has been buried alive to ring a bell to call for help . </P>

Where does the term dead ringer come from
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