black marketˌblack ˈmarket [countableC]COMMERCELAW1the illegal buying and selling of goods that are usually impossible to get in a particular city or countryA pack of foreign cigarettes on the black market goes for the equivalent of at least $17.
2the buying of foreign currency at an unofficial rateThe official exchange rate is about 5.6 kyat to the dollar, or more than 10 times its current value on the black market.
→ market