So what is this Great Vowel Shift you mentioned?

Ah, yes.

Well, that is...

It's, it's called a Great Vowel Shift as if it's a great war and it happened in one period.

But as I mentioned it, it takes place over several centuries, and I can't remember the chap's name, but it was a Scandinavian linguist who coined that phrase, I think, in 1909 or somewhere around there.

And it is the phenomenon of if you think of your mouth as a geography, people used to pronounce things much lower down.

The word meat, meat, which is up there now, would've been pronounced meat, something like that.

So what were some of the other big turning points in English, the development of the English language?