I believe the term originates with this historical event: https://en.wikipedia.org/wiki/Defenestrations_of_Prague https://en.wikipedia.org/wiki/Defenestrations

I believe the term originates with this historical event: https://en.wikipedia.org/wiki/Defenestrations_of_Prague https://en.wikipedia.org/wiki/Defenestrations_of_Prague And if you believe Wiki, it was used originally in Middle French.