I recently published 25 "vanished American words" that someone born around 1950 would understand and those born after 1960 would probably not. I asked for additional suggestions and got many. Selecting out the best of them, here is a new list, now over four times longer. Some are very obscure (Gestetner) and others not so much (telephone booth).
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As an aside, two readers protested the inclusion of "party line" as a vanished phrase. No, one replied, it "is still alive and well," as in the example, "the MSM follows the Democrat party line." Yes, but I meant a telephone party line; the readers' unfamiliarity with this phenomenon neatly confirms my point. (January 9, 2022)