Could Downton Abbey Characters Go 'Over to the Dark Side'?

Though the phrase 'over to the dark side' sounds anachronistic, there's evidence that it could have been overheard on an English manor in 1925. In a piece for The New York Times, Louis Bayard wrote: Speaking of “Star Wars,” I’ve heard from several Abbots who thought the recent usage of “over to the dark side” was a bald anachronism. I confess I’m wondering the same thing about Dr. Ryder’s “cautiou

[saebou]

"go over to the dark side"という言い方、実は『スター・ウォーズ』が初出ではなく、1920年代にはふつうに使われていたらしい。