grey mar·ket
noun/ˌɡreɪ ˈmɑːkɪt/
/ˌɡreɪ ˈmɑːrkɪt/
(US English usually gray market)
[usually singular]- a system in which products are imported into a country and sold without the permission of the company that produced them
灰市，水货市场（未经生产公司授权而进口并销售其产品） - (British English) old people, when they are thought of as customers for goods
（统称）老年顾客，老年客户