Someone who looks exactly like someone else.
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Someone or something that looks exactly like another person or thing.
A dead ringer is a near-perfect lookalike — the resemblance is so strong it can fool people.
It's often used with surprise or amusement.
"Spitting Image"
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Very similar — also means an exact lookalike; slightly more common in British English
"Doppelganger"
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A ghostly double — more eerie in tone, not just a casual lookalike
"Dead Ringer"
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A near-perfect physical lookalike of someone or something else