open-line

[ oh-puh n-lahyn ]
/ ˈoʊ pənˌlaɪn /

adjective

(of a radio or TV show) maintaining open telephone lines to permit listeners or viewers to phone a program with comments, questions, requests, etc.; call-in.

Origin of open-line

First recorded in 1965–70

British Dictionary definitions for open-line

open-line

noun

Canadian a radio or television programme in which listeners' or viewers' questions, comments, etc, are telephoned to the studio and broadcast live. Also called (in Britain and certain other countries): phone-in