The term 'abrade by rubbing' can be summarized as the process of chafing. Chafing is a form of abrasion, which is the wearing away of a surface due to friction. It is caused by the repeated rubbing of two surfaces against each other, often resulting in damage to the surface. Chafing is commonly seen in clothing, where it can cause fabric to wear away and become thin. It can also occur in other materials, such as metal, wood, and stone.