Mr. Bumble, having spread a handkerchief over his knees to prevent the crumbs from sullying the splendour of his shorts, began to eat and drink; varying these amusements, occasionally, by fetching a deep sigh; which, however, had no injurious effect upon his appetite, but, on the contrary, rather seemed to facilitate his operations in the tea and toast department.
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.