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black market

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noun [singular] economics American English pronunciation: black market 
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singularblack market
pluralblack markets
  1. the illegal buying and selling of goods, especially when it is difficult or expensive to obtain them legally

    There's a thriving black market in vodka and cigarettes.

    on the black market:

    Rhino horns can fetch up to $5,000 on the black market.

derived word

black marketeer

 American English pronunciation: black marketeer  noun [countable]
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singularblack marketeer
pluralblack marketeers

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