Why English Spelling Stopped Matching English Sound

Between roughly 1400 and 1700, every long vowel in English moved. Linguists call it the Great Vowel Shift, and it explains why English looks like it sounds nothing like itself. Chaucer's time, written tyme and pronounced something like "teem-uh," became modern "tyme." House shifted from "hoose" to "howse." Meet moved from a long e sound (roughly "mate") to the modern "meet." The vowels chained upward in the mouth, and at the top, the highest vowels — the old long i and u — had nowhere to go and broke into diphthongs.

Why it happened is unsettled. The leading hypotheses involve some combination of post-plague dialect contact (London absorbed waves of refugees from the East Midlands after 1348), social hypercorrection by an emerging merchant class, and ordinary chain-shift mechanics where one moving vowel pushes its neighbors to make room. None of the explanations is fully satisfying, partly because the shift was already underway before anyone thought to write down what English sounded like.

The accident of timing is what locked the spelling into place. William Caxton set up England's first printing press at Westminster in 1476, mid-shift. The orthography he and his successors used was already a generation behind the spoken language, and once books standardized those spellings across thousands of copies, it became expensive to change them. Samuel Johnson's 1755 dictionary then formalized what print had already frozen.

That is why knight still has a k (silent since the 1500s), night still has a gh (a guttural that died out earlier still), and the same letter cluster -ough spells six different sounds in though, through, thought, cough, bough, and hiccough. The spellings remember a language nobody has spoken for 500 years.