backchannel
noun /ˈbæktʃænl/
/ˈbæktʃænl/
- a secret or unusual way of passing information to other people
(传递消息的)秘密渠道,特殊途径 - (linguistics
) a sound or sign that somebody makes to show that they are listening to the person who is talking to them语言学 言语反馈示意,反输, 附应 (以声音或示意作为对说话人的反馈)