Sharp blows is a term used to describe a variety of forceful impacts. Raps, THWACKS, SWATS, knaps, and smacks are all words that can be used to describe sharp blows. Raps are short, sharp blows, usually made with the knuckles. THWACKS are strong, heavy blows, often made with a stick or other object. SWATS are quick, hard blows, usually made with an open hand. Knaps are sharp, sudden blows, usually made with a flat object. Smacks are light, sharp blows, usually made with the palm of the hand.