1. A market or commercial activity that operates outside the law, involving the buying and selling of illegal goods or services
The police cracked down on the illegal market for counterfeit goods.
A polícia fez uma operação contra o mercado ilegal de produtos falsificados.
2. Underground economy; shadow market involving prohibited or unregistered commercial transactions
Weapons trafficking is a major concern in the illegal market.
O tráfico de armas é uma grande preocupação no mercado ilegal.