Definition of black market noun from the Oxford Advanced Learner's Dictionary

 

black market

 noun
noun
BrE
 
; NAmE
 
[usually singular] Economy
 
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an illegal form of trade in which foreign money, or goods that are difficult to obtain, are bought and sold to buy or sell goods on the black market a flourishing black market in foreign currency During the war, there was a thriving black market in food. You could buy anything you needed on the black market. See related entries: Economy
See the Oxford Advanced American Dictionary entry: black market