to pull a comb through your hair in order to make it neat 梳，梳理（头发）
Don’t forget to comb your hair!
别忘了梳一下头发！
Her hair was neatly combed back.
她的头发整齐地梳到后面。
noun
A comb is a flat piece of plastic or metal with narrow, pointed teeth along one side, which you use to make your hair neat.