a tuft of hair that grows in a different direction from the rest of the hair and usually will not lie flat
cowlick详细解释
cow.lick
n.（名词） A projecting tuft of hair on the head that grows in a different direction from the rest of the hair and will not lie flat. 反毛：头上翘着的一绺头发，与其他头发的方向不一致且不易压平
