pyramid selling
noun [ U ] uk/ˈpɪr.ə.mɪd ˌsel.ɪŋ/ us/ˈpɪr.ə.mɪd ˌsel.ɪŋ/
宝塔式销售，传销
in business, the act of someone buying the right to sell a company's goods, and then selling the goods to other people. These people then sell the goods to other people.