Etymology

doppelganger

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Today it means: A ghostly double of a living person, especially one that haunts such a person. Full definition →

German Doppelgänger
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The story

  1. German · borrowed fromDoppelgänger“ghostly spirit”
  2. English todaydoppelganger

Borrowed from German Doppelgänger (“ghostly spirit”, literally “double-walker”).

Etymology from Wiktionary, CC BY-SA 4.0.