noun, noun which may take the genitive case particle 'no'
illegal channel; back channel; black market route
Refers to unofficial, often illegal, means of obtaining goods, information, or access, bypassing normal procedures.
He was selling tickets obtained through a back channel.
That information came through an unofficial channel.
Compound of 裏 (ura, 'back, reverse, hidden') and ルート (rūto, from English 'route'), literally 'back route'.