To scrape and roughen the surface – seeds with a hard outer shell germinate faster when scuffed.
Abrasion is the process of scuffing, scratching, wearing down, marring, or rubbing away. It can be intentionally imposed in a controlled process using an abrasive. Abrasion can be an undesirable effect of exposure to normal use or exposure to the elements.

English
Pronunciation
- (Received Pronunciation, General American) IPA(key): /skʌf/
- (General Australian, New Zealand) IPA(key): /skɐf/
- (Northern England) IPA(key): /skʊf/
- Rhymes: -ʌf
Etymology 1
From Scots scuff (“to touch lightly, graze, hit”), of obscure origin. Perhaps from Old Norse skúfa (“to shove, push aside”), from Proto-Germanic *skeubaną (“to shove”). Or, perhaps imitative. More at English
... Read More