/ˈsiːkrɪt ˈtræfɪk/ – Phrase
Definition: buôn bán bí mật.
A more thorough explanation: “Secret traffic” refers to the illegal transportation or smuggling of goods, people, or information in a clandestine or covert manner, often in violation of laws and regulations.
Example: The company was found guilty of engaging in secret traffic of counterfeit goods across international borders.