Consider the trope or joke about making a "Freudian slip".
(Firstly, question A, - what year did that trope or joke originate?)
This trope was recently discussed, and, as an incidental matter, my opinion was:
'That trope - jokes about 'Freudian slips' - was current in say the 60s, maybe the 70s. But it is little-heard now; young people wouldn't even know what you're talking about.'
(Maybe I'm completely wrong; maybe I'm right.)
So, is there a way to determine the popularity of usage, of "Freudian slip", from year A through to the present?
Can linguists (or .. somebody?) come up with a graph showing the usage of "Freudian slip" (in the specific example at hand) over the decades - how would one actually show whether I'm right or wrong in the proposal at hand?
More generally for a given trope, or perhaps idiom, how really can you show that it is "out of use" and only "ancient people know or use it" ... ? Is there a way? What's the deal on this?
There seems to be some confusion with folks presenting something about "N-GRAMS". I truly thank you and it seems like amazing technology, but what is it? References from TV (sitcoms etc, the main use of the phrase) ... magazine articles .. the internet? (Surely that would only apply since "the internet" was in existence?)