’I might have got clear off, if I’d split upon her; mightn’t I, Fagin?’ angrily pursued the poor half-witted dupe.
It is worthy of remark, as illustrating the importance we attach to our own judgments, and the pride with which we put forth our most rash and hasty conclusions, that, although Mr. Grimwig was not by any means a bad-hearted man, and though he would have been unfeignedly sorry to see his respected friend duped and deceived, he really did most earnestly and strongly hope at that moment, that Oliver Twist might not come back.
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.