[oh-puh n-lahyn] /ˈoʊ pənˌlaɪn/

(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.
(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


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