grizzle
n. US //ˈɡɹɪzəɫ// UK //ɡɹˈɪzəl// griz·zle
From Middle English grisel, gryselle, from Old French grisel, from gris (“grey”), from Frankish grīs, from Proto-Germanic grīsaz.
A West Country dialect term, perhaps from Old English grisan (“shudder”), which would make it a cognate of modern English grisly (not grizzly).