IPA: /ˈtɔːk.bæk/
KK: /ˈtɔkˌbæk/
A communication system that allows for two-way interaction, often used in television or radio studios to give directions during a program.
The director used the talkback system to communicate with the crew while the show was live.
Talkback is formed from "talk" (from Old English *talecan*, meaning to speak or converse) and "back" (from Old English *bæc*, meaning in return or in response). The word refers to a response or reply, often in a challenging or argumentative manner, to someone who has spoken or given an order.
Think of 'talking' back as giving a 'response' to someone who has just spoken — that's why talkback means to reply or respond.
No commonly confused words.