noun
a ghostly double or counterpart of a living person
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The concept of a doppelganger in literature often symbolizes a character's inner conflict.
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I swear I saw my doppelganger at the mall yesterday, it was so weird!
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Dude, you look like my doppelganger! It's like we could be twins!
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Her constant need for validation is like a doppelganger that follows her everywhere.