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open-line

[oh-puh n-lahyn]
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adjective
  1. (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.
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Origin of open-line

First recorded in 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for open-line

open-line

noun
  1. 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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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012