Mrs. Penniman told him nothing, partly because he never questioned her—he made too light of Mrs. Penniman for that—and partly because she flattered herself that a tormenting reserve, and a serene profession of ignorance, would avenge her for his theory that she had meddled in the matter.
There are no more uses of "avenge" in the book.
Show samples from other sources
He wants to avenge the murder of his brother
You are the representative of justice here, and it is for justice to avenge those she has been unable to protect.