captive audience

captive audience idiom
Listeners or onlookers who have no choice but to attend. For example, It's a required course and, knowing he has a captive audience, the professor rambles on endlessly. This expression, first recorded in 1902, uses captive in the sense of “unable to escape.”

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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