captive audience
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."
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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a gadget; dingus; thingumbob. |