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Noun: back channel
  1. An alternative to the regular channels of communication that is used when agreements must be made secretly (especially in diplomacy or government)
    "they negotiated via a back channel"
Adjective: back-channel
  1. Via a back channel
    "the failure of back-channel negotiations"

Derived forms: back channels

Type of: channel, communication channel, line

Encyclopedia: Back channel

Back-channel