/blæk ˈmɑːrkɪt/ – Phrase
Definition: thị trường đen, chợ đen.
A more thorough explanation: The term “black market” refers to an illegal or underground economy in which goods or services are bought and sold outside of the formal channels of commerce, typically to avoid government regulations, taxes, or restrictions.
Example: The sale of counterfeit goods on the black market is illegal and punishable by law.