black market
noun /ˌblæk ˈmɑːkɪt/
  /ˌblæk ˈmɑːrkɪt/
 [usually singular]- an illegal form of trade in which foreign money, or goods that are difficult to obtain, are bought and sold黑市(交易) -  on the black market to buy or sell goods on the black market从事黑市买卖 
- You could buy anything you needed on the black market.在黑市上你需要什么就能买到什么。 
-  black market in something a flourishing black market in foreign currency猖獗的外币黑市交易 
- During the war, there was a thriving black market in food.战争期间,黑市食品买卖十分活跃。 
 Collocations Dictionaryadjective- thriving
- lucrative
 - activity
- trade
 - on the black market
- black market in
 
-  on the black market to buy or sell goods on the black market