Great Vowel Shift
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The Great Vowel Shift was a major change in the pronunciation of the English language that took place in England between 1350 and 1700. Through the Great Vowel Shift, all Middle English long vowels changed their pronunciation. Because English spelling was becoming standardized in the 15th and 16th centuries, the Great Vowel Shift is responsible for many of the peculiarities of English spelling.
History of analysis
The main difference between the pronunciation of Middle English in the year 1400 and Modern English is in the value of the long vowels. Long vowels in Middle English had "continental" values much like those in Italian and Standard German, but in standard Modern English they have entirely different pronunciations. This change in pronunciation is known as the Great Vowel Shift.
|Late Middle English
before the GVS
after the GVS
|boat||/ɔː/||GA /oʊ/, RP /əʊ/|
This timeline shows the main vowel changes that occurred between late Middle English in the year 1400 and Modern English in the mid-20th century, using representative words. The Great Vowel Shift occurred in the lower half of the table, between the years 1400 and 1600. The changes that happened after 1600 are not usually considered part of the Great Vowel Shift proper. Pronunciation is given in the International Phonetic Alphabet:
Middle English vowel system
Before the Great Vowel Shift, Middle English in Southern England had seven long vowels, /iː eː ɛː aː ɔː oː uː/. These vowels occurred in the words bite, meet, meat, mate, boat, boot, and out.
|close||/iː/: bite||/uː/: out|
|close-mid||/eː/: meet||/oː/: boot|
|open-mid||/ɛː/: meat||/ɔː/: boat|
These words had very different pronunciations in Middle English from their pronunciations in Modern English. Long i in bite was pronounced as /iː/, so that Middle English bite sounded like Modern English beet /biːt/; long e in meet was pronounced as /eː/, so Middle English meet sounded similar to Modern English mate /meɪt/; long a in mate was pronounced as /aː/, with a vowel like Modern English ah in father /fɑːðər/; and long o in boot was pronounced as /oː/, similar to modern oa in American English boat /oʊ/. In addition, Middle English had a long /ɛː/ in beat, similar to modern short e in bed except pronounced longer, and a long /ɔː/ in boat, similar to the vowel of law /lɔː/ in British English.
After around 1300, the long vowels of Middle English began changing in pronunciation. The two closest vowels, /iː uː/, became diphthongs (vowel breaking), and the other five, /eː ɛː aː ɔː oː/, underwent an increase in tongue height (raising). These changes are known as the Great Vowel Shift.
These changes occurred over several centuries, and can be divided into two phases. The first phase affected the close vowels /iː uː/ and the close-mid vowels /eː oː/: /eː oː/ were raised to /iː uː/, and /iː uː/ became the diphthongs /ei ou/ or /əi əu/. The second phase affected the open vowel /aː/ and the open-mid vowels /ɛː ɔː/: /aː ɛː ɔː/ were raised, in most cases changing to /eː iː oː/.
The Great Vowel Shift changed vowels without merger, meaning that Middle English before the vowel shift had the same number of vowel phonemes as Early Modern English after the vowel shift. After the Great Vowel Shift, some vowel phonemes began merging. Immediately after the Great Vowel Shift, the vowels of meet and meat were different, but in Modern English they are merged, and both words are pronounced as /miːt/. However, during the 16th and 17th centuries, there were many different mergers, and some mergers can be seen in individual Modern English words like great, which is pronounced with the vowel /eɪ/ as in mate, rather than the vowel /iː/ as in meat.
This is a simplified picture of the changes that happened between late Middle English and today's English. Pronunciations in the years 1400, 1500, 1600, and 2000 are shown. To hear recordings of the sounds, click the phonetic symbols.
Before labial consonants, /uː/ did not shift, and [uː] remains as in soup and room (its Middle English spelling was roum).
The first phase of the Great Vowel Shift affected the Middle English close-mid vowels /eː oː/, as in beet and boot, and the close vowels /iː uː/, as in bite and out. The close-mid vowels /eː oː/ became close /iː uː/, and the close vowels /iː uː/ became diphthongs. The first phase was complete in 1500, meaning that by that time, words like beet and boot had lost their Middle English pronunciation, and were pronounced with the same vowels as in Modern English. The words bite and out were pronounced with diphthongs, but not the same diphthongs as in Modern English.
Scholars agree that the Middle English close vowels /iː uː/ became diphthongs around the year 1500, but disagree about what diphthongs they changed to. According to Lass, the words bite and out after diphthongization were pronounced as /beit/ and /out/, similar to American English bait /beɪt/ and oat /oʊt/. Later, the diphthongs /ei ou/ shifted to /ɛi ɔu/, then /əi əu/, and finally to Modern English /aɪ aʊ/. This sequence of events is supported by the testimony of orthoepists before Hodges in 1644.
However, many scholars such as Dobson (1968), Kökeritz (1953), and Cercignani (1981) argue for theoretical reasons that, contrary to what 16th-century witnesses report, the vowels /iː uː/ were actually immediately centralized and lowered to [əi əu].
Logically, the close vowels /iː uː/ had to diphthongize before the close-mid vowels /eː oː/ raised, or else /eː/ would have merged with /iː/, and /oː/ with / uː/, and the words beet and bite, boot and out, would have the same vowels. But evidence from regional dialects shows that raising of the close-mid vowels /eː oː/ caused the close vowels /iː uː/ to shift, not the other way around. As the Middle English vowels /eː oː/ were raised towards /iː uː/, they forced the original Middle English /iː uː/ out of place, causing them to become diphthongs /ei ou/. This type of vowel shift is called a push chain.
The second phase of the Great Vowel Shift affected the Middle English open vowel /aː/, as in mate, and the Middle English open-mid vowels /ɛː ɔː/, as in meat and boat. The second phase consisted of two parts. First, around 1550 Middle English /aː/ was raised to /æː/. Second, after 1600 this new /æː/ was raised to /ɛː/ and the Middle English open-mid vowels /ɛː ɔː/ were raised to close-mid /eː oː/. 
During the first and second phases of the Great Vowel Shift, long vowels were shifted without merging with other vowels, but after the second phase, several vowels merged. These later changes also involved the Middle English diphthong /ai/, as in day, which had monophthongized to /ɛː/, and either merged with Middle English /aː/ as in mate or /ɛː/ as in meat.
During the 16th and 17th centuries, several different pronunciation variants existed among different parts of the population for words like meet, meat, mate, and day. In each pronunciation variant, different pairs or trios of words were merged in pronunciation. Four different pronunciation variants are shown in the table below. The third pronunciation variant gave rise to Modern English pronunciation. In Modern English, meet and meat are merged in pronunciation and both have the vowel /iː/, and mate and day are merged with the diphthong /eɪ/, which developed from the 16th-century long vowel /eː/.
|Word||16th century pronunciation variants|
Modern English typically has the meet–meat merger: both meet and meat are pronounced with the vowel /iː/. Words like great and steak, however, have merged with mate and are pronounced with the vowel /eɪ/, which developed from the /eː/ shown in the table above.
Northern English and Scots
The Great Vowel Shift affected other dialects as well as the standard English of southern England, but in different ways. In Northern English, the long back vowels remained unaffected, because the long front vowels had undergone an earlier shift.[contradiction] The Scots language in Scotland had a different vowel system before the Great Vowel Shift. The long vowels [iː], [eː] and [aː] shifted to [ei], [iː] and [eː] by the Middle Scots period, [oː] had shifted to [øː] in Early Scots and [uː] remained unaffected.
Northern English and Scots went through the Great Vowel Shift like the English in Southern England, but the developments of Middle English /iː eː/ and /oː uː/ were different from Southern English. In particular, Northern English has shifting of /iː eː oː/, but not of /uː/. The words bite, feet, boot have shifted vowels, but house does not:
This lack of diphthongization of /uː/ is explained by the Northern English development of the Middle English vowel /oː/, as in boot. Before the Great Vowel Shift, /oː/ was fronted and changed to front mid /øː/. Thus, there was no /oː/ in Northern English, only /uː/, at the time of the Great Vowel Shift, but there were three front vowels, /iː eː øː/:
The Great Vowel Shift acted on these Northern and Southern Middle English vowel systems. In both Northern and Southern English, close-mid vowels were raised: Northern /eː øː/ were raised to /iː, yː/ (and later /yː/ was unrounded to /iː/), and Southern /eː oː/ were raised to /iː uː/. But in Southern English, both the front and back close vowels /iː uː/ were diphthongized, while in Northern English /iː/ diphthongized, but /uː/ did not.
If this Northern–Southern difference is related to the vowel systems shown above, then the lack of the back mid vowel /oː/ in Northern English explains why /uː/ did not shift. In Southern English, shifting of /oː/ to /uː/ must have caused diphthongization of original /uː/, but because Northern English had no back close-mid vowel /oː/ to shift, the back close vowel /uː/ did not diphthongize.
||This article possibly contains original research. (July 2015)|
Not all words underwent certain phases of the Great Vowel Shift. ea in particular did not take the step to [iː] in several words, such as great, break, steak, swear, and bear. The vowels mentioned in words like break or steak underwent shortening, possibly due to the plosives following the vowels, and then diphthongization. The presence of [r] in swear and bear caused the vowel quality to be retained, though not in all cases. Other examples are father, which failed to become [ɛː], and broad, which failed to become [oʊ]. The word room, which was spelled as roum in Middle English, retains its Middle English pronunciation, so it is an exception to the shifting of [uː] to [aʊ]. This is because it is followed by m, a labial consonant.
Shortening of long vowels at various stages produced further complications. ea is again a good example, shortening commonly before coronal consonants such as d and th, thus: dead, head, threat, wealth etc. (This is known as the bred–bread merger.) oo was shortened from [uː] to [ʊ] in many cases before k, d and less commonly t, thus book, foot, good etc. Some cases subsequently changed from [ʊ] to [ʌ]: blood, flood. Similar, yet older shortening occurred for some instances of ou: could.
Note that some loanwords, such as soufflé and Umlaut, have retained a spelling from their origin language that may seem similar to the previous examples; but, since they were not a part of English at the time of the Great Vowel Shift, they are not actually exceptions to the shift.
The printing press was introduced to England in the 1470s by William Caxton and later Richard Pynson. The adoption and use of the printing press accelerated the process of standardization of English spelling which continued into the 16th century. The standard spellings were those of Middle English pronunciation, as well as spelling conventions continued from Old English. However, the Middle English spellings were retained into Modern English while the Great Vowel Shift was taking place, resulting in some of the peculiarities of Modern English spelling in relation to vowels.
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