- a secret, unofficial, or informal channel of communication as used in politics or diplomacy: sensitive information passed on through a back channel.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for backchannel
It essentially uses the award as a backchannel to decisively endorse the Polish version of the Katyn events.The Kremlin's Amazing PR Turnaround
June 8, 2010