Lots of fun, as usual, and a few surprises too. I would have guessed that wisecrack, for instance, was much older.
I need some license
You’ve got it as far as I’m concerned, Dave! All the license in the world, so long as you keep up the game!
“First appearance in the OED” is a convenient way of putting a date to words that made it from other languages into English without being translated, such as lumpenproletariat, zeitgeist, élan, sang-froid, tortilla, etc. Is lumpenproletariat cited in italics? Perhaps the date when such words lose the italics could be considered the date on which they become English words. Or do they become English simply by appearing in the OED, italics or not?
(wishes once more that he had access to the OED. Sighs)