From this state of humiliation, she was roused, at the end of ten minutes, to a pleasanter feeling, by seeing, not Mr. Thorpe, but Mr. Tilney, within three yards of the place where they sat; he seemed to be moving that way, but he did not see her, and therefore the smile and the blush, which his sudden reappearance raised in Catherine, passed away without sullying her heroic importance.
There are no more uses of "sully" in the book.
Show samples from other sources
And though in near time we did sleep together (with a genuinely pleasing, if sober, conviviality), I came to think of that first interlude with a somewhat sorrowful fondness, for I saw that our days together were perhaps sullied from the very beginning and all the way through, right up to the last.
Chang-rae Lee -- A Gesture Life
Maybe I would waste my time on skills I didn’t care about—like sword fighting or badminton—but I would not sully the memory of my once-perfect music and archery.