free gift
noun [ C ] uk/ˌfriː ˈɡɪft/ us/ˌfriː ˈɡɪft/
促销赠品
a product that is given to a customer free when they buy something in order to encourage people to buy more of it
You get a free gift if you spend more than £20. 如果您消费超过20英镑，就会获得一份赠品。