They had a short conference upon some money matters then in progress, which were scarcely disposed of when the lordly dupe (in pursuance of his friend’s instructions) requested with some embarrassment to speak to Ralph alone.
I have been a dupe and a fool to him long enough.
When it is remembered that Sir Mulberry Hawk had plundered, duped, deceived, and fooled his pupil in every possible way, it will not be wondered at, that, beginning to hate him, he began to hate him cordially.
Such was the ascendancy he had acquired over his dupe, and such the latter’s general habit of submission, that, for the moment, the young man seemed half afraid to pursue the subject.
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.