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).
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)