裏うらルート

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.

• 彼かれは裏うらルートで入にゅう手しゅしたチケットを売うっていた。

  He was selling tickets obtained through a back channel.

• その情じょう報ほうは裏うらルートから流ながれてきた。

  That information came through an unofficial channel.