Or, once more, the electric thrill would give her warning—"Behold Hester, here is a companion!" and, looking up, she would detect the eyes of a young maiden glancing at the scarlet letter, shyly and aside, and quickly averted, with a faint, chill crimson in her cheeks as if her purity were somewhat sullied by that momentary glance.
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.