"The years that are gone seem like dreams—if one might go on sleeping and dreaming—but to wake up and find—oh! well! perhaps it is better to wake up after all, even to suffer, rather than to remain a dupe to illusions all one’s life."
There are no more uses of "dupe" in the book.
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The immigrant was duped because he trusted everyone
She is innocent. She was duped like the rest of us.