grizzle

n. [ F. gris: cf. grisaille hair partly gray, fr. gris gray. See Gris, and cf. Grisaille. ] Gray; a gray color; a mixture of white and black. Shak. [ 1913 Webster ]

v. t. & i. To make or become grizzly, or grayish. [ Webster 1913 Suppl. ]

Hardship of the way such as would grizzle little children. R. F. Burton. [ Webster 1913 Suppl. ]

I found myself on the Nubian desert shaking hands with a
grizzling man whom men addressed as Collins Bey. Pall Mall Mag. [ Webster 1913 Suppl. ]