Слово "whiten". Англо-русский словарь Мюллера

A raw wind was blowing, and the first flurries of snow were whitening the hilltops.

"It was the end of September; the wind blew violently. The faint glimpses of the pale moon, hidden momentarily by masses of dark clouds that were sweeping across the sky, whitened the gravel walks that led to the house, but were unable to pierce the obscurity of the thick shrubberies, in which a man could conceal himself without any fear of discovery.

“You can imagine from what I say that my poor sister Julia and I had no great pleasure in our lives. No servant would stay with us, and for a long time we did all the work of the house. She was but thirty at the time of her death, and yet her hair had already begun to whiten, even as mine has.”