a device that is used for repeatedly hitting something, especially in order to clean it, or for mixing foods. Beater is often used as a combining form

an electric beater 电动搅拌器

a carpet beater 地毯拍打器

an egg beater 打蛋机

used as a combining form to refer to a person who repeatedly hits people, especially members of their family

a wife-beater 经常打老婆的人

a person paid by people hunting to force birds and animals into a place where they can be seen and therefore shot