I am to blame, and punish me, make me expiate my fault.
That now, having expiated his sin against the husband, he was bound to renounce her, and never in future to stand between her with her repentance and her husband, he had firmly decided in his heart; but he could not tear out of his heart his regret at the loss of her love, he could not erase from his memory those moments of happiness that he had so little prized at the time, and that haunted him in all their charm.
There are no more uses of "expiate" in the book.
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She knows she can’t expiate her sins, but hopes to heal some of the wounds.
And when there is also a feeling of guilt to be overcome, and, maybe, expiated,