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Adjective: back-channel
  1. Via a back channel
    "the failure of back-channel negotiations"
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"

Derived forms: back channels

Type of: channel, communication channel, line

Encyclopedia: Back-channel

Back channel