Etymology

teach-in

Today it means: An extended session of lectures, debates or discussions on a matter of public interest, usually social or political, as a form of protest. Full definition →

First used 1965
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The story

From teach + -in, modeled after sit-in.

First known use, by meaning

  • from 1965 An extended session of lectures, debates or discussions on a matter of public interest, usually social or political, as a form of protest.

Etymology from Wiktionary, CC BY-SA 4.0.