I'm quite certain you meant to write the following: pay her uncle his just due. "Due" means what is owed to him or what he deserves. "Just" means what is fair or what would be justice.
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I'm quite certain you meant to write the following:
pay her uncle his just due.
"Due" means what is owed to him or what he deserves. "Just" means what is fair or what would be justice. So the sentence means that the person (she) should give her uncle what he deserves. Apparently, he deserves something bad. Not having read the story, I'm not sure, but we usually use that p