scruff · noun1
See scurf.
scruff · noun, verb2
1790, from earlier (1787) scuft and dialect scuff, influenced by scruff (“crust”). Related to North Frisian skuft (“back of the neck of a horse”) and Dutch schoft (“withers (of a horse)”), from Proto-Germanic. Compare also Old Norse skopt (“hair of the head”), Gothic 𐍃𐌺𐌿𐍆𐍄 (skuft, “hair of the head”), Middle High German schopf (German Schopf).
Etymology from Wiktionary, CC BY-SA 4.0.