black-market channels; illegal channels
Refers to distribution or procurement routes that operate outside legal or official systems, often for controlled goods, tickets, or information.
Popular limited-edition items are being traded at high prices through black-market channels.
He was reselling tickets he had obtained through illegal channels.
Compound of 闇 (yami, 'darkness; underground') and ルート (rūto, from English 'route'). The combination directly conveys a hidden or illegal pathway.