/ˈkʌstəm ʌv ˈmɜːrtʃənts/ – Phrase
Definition: tập quán thương mại, tục lệ thương mại, luật pháp theo tập quán trong thương mại.
A more throughout explanation: The legal English definition of the term “custom of merchants” refers to a body of unwritten rules and practices that have been developed and accepted by merchants engaged in commercial activities. These customs are considered to be binding and enforceable in commercial transactions, and they often supplement or modify existing laws and regulations governing business dealings. The custom of merchants is recognized as a source of commercial law and is commonly used to resolve disputes in commercial matters.
Example: The custom of merchants dictates that payment is due within 30 days of receiving the goods.