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It was more of a gradual evolution, in which younger people, for some reason, began saying their vowels differently from their elders, and then the next generation said them a little more differently than that, and then the next generation, and so on.
The process was something like this, most likely.
Gen 1: hus "hoos" Gen 2: "hyoos" Gen 3: "hee-yoos" Gen 4: "hay-yoos" Gen 5: "haaoos" (as in a Georgia or Carolina accent) Gen 6: "hahoos" "house"
The same kinds of changes are going on today in different types of English. Think, for example, of the way some people in the New York City and Southern New England areas pronounce "bear" as "biya," or the way Australians pronounce "mate" as "mite" and "mite" as "moyt."
The weird thing about the medieval vowel shift is that it happened in both English and High German at about the same time, even though the languages had little contact with each other.
Now that we've had recorded sound for over a hundred years, linguists of the future will be able to chart sound changes very precisely.
Note that nobody really talks like 1930s movies anymore. The differences are subtle, but they're evident if you listen closely.
The same types of phenomena have occurred in Japanese. For instance, the Japanese word for "yen" is "en." The reason we say "yen" is that the Japanese DID say "yen" in the mid-nineteenth century when large numbers of Westerners first went there. At that time, some words that now begin with "e-" began with "ye-," while others, which had once begun with "we-" centuries before already began with "e-." At some time between then and now, the "ye-" syllable disappeared completely and merged with "e-." There is no "why." It just did.
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