ˈgrey ˌmarket BrE AmE British English , gray market American English noun [countable]
1 . the system by which people buy and sell goods that are hard to find, in a way that is legal but not morally good or correct ⇨ black market
2 . technical a situation in which people are buying and selling ↑ share s just before they are officially made available to be sold for the first time