Dead ringer is an
idiom
An idiom is a phrase or expression that typically presents a figurative, non-literal meaning attached to the phrase; but some phrases become figurative idioms while retaining the literal meaning of the phrase. Categorized as formulaic language, ...
in English. It means "an exact duplicate" or "100% 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".
[ Citing the '' Manitoba Free Press'', October 1882.]
The term is sometimes said to derive, like "saved by the bell", from a custom of providing a cord in coffins for someone who has been
buried alive
Premature burial, also known as live burial, burial alive, or vivisepulture, means to be buried while still alive.
Animals or humans may be buried alive accidentally on the mistaken assumption that they are dead, or intentionally as a form of t ...
to ring a bell to call for help, but this appears to be a
folk etymology
Folk etymology (also known as popular etymology, analogical reformation, reanalysis, morphological reanalysis or etymological reinterpretation) is a change in a word or phrase resulting from the replacement of an unfamiliar form by a more famili ...
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References
English-language idioms
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