Sound changes
This article describes those aspects of the phonological history of English which concern consonants.
Stops.
Aspiration.
The voiceless stops , , are typically aspirated when they begin a stressed syllable, becoming , as described under English phonology (obstruents). There is some regional variation in the degree of aspiration, and in some Scottish and northern English accents aspiration does not occur at all.
In certain accents, such as Geordie (among younger women) and in some speakers of Dublin English, , and can be preaspirated when they come at the end of a word or utterance, becoming .
Flapping.
Flapping, or tapping, is a process whereby or is pronounced as the alveolar flap in certain positions, especially between vowels (but also sometimes after other sonorants). It may be perceived as, for example, the pronunciation of "butter" as "budder". It occurs especially in North American English (to varying extents) and in Australian and New Zealand English.
Voicing.
Apart from the T-voicing that results from flapping (described above), some dialects feature other instances of voicing or lenition of the stops , and . In Geordie, these stops may be fully voiced (, , ) in intervocalic position. In Devon, stops and other obstruents may be voiced (or at least lenited) between vowels and when final after a weak vowel, so for example the and in "jacket" may approach the realizations and , making the word sound similar or identical to "jagged".
Glottalization.
Stops, chiefly the voiceless stops, and especially , are frequently glottalized or pre-glottalized in certain positions; that is, a stop may be replaced with the glottal stop , or else a glottal stop may be inserted before it. These phenomena are strongly dependent on the phonetic environment and on dialect. For details, see T-glottalization, as well as English phonology (obstruents) and glottalization in consonant clusters.
If all final voiceless stops are glottalized, as may occur in some London speech, then sets of words such as "lick", "lit" and "lip" may become homophones, pronounced .
Fricatives and affricates.
H-dropping and H-insertion.
H-dropping is the omission of initial in words like "house", "heat" and "hangover". It is common in many dialects, especially in England, Wales, Australia and Jamaica, but is generally stigmatized, and is not a feature of the standard accents. The is nonetheless frequently dropped in all forms of English in the weak forms of function words like "he", "him", "her", "his", "had" and "have". The opposite of H-dropping, called H-insertion or H-adding, may arise as a hypercorrection by typically H-dropping speakers, or as a spelling pronunciation.
Loss of velar and palatal fricatives.
The voiceless velar and palatal fricative sounds and , considered to be allophones of and reflected by the ⟨gh⟩ in the spelling of words such as "night", "taught" and "weight", were lost in later Middle English or in Early Modern English. Their loss was accompanied by certain changes in the previous vowels. In some cases became , as in "laugh".
A is still heard in words of the above type in certain Scots and northern English traditional dialect speech. A is more commonly heard, especially in the Celtic countries but also for many speakers elsewhere, in the word "loch" and in certain proper names such as "Buchan".
Alexander John Ellis reported use of [x] in England on the Yorkshire-Lancashire border and close to the Scottish border in the late nineteenth century.
For details of the above phenomena, see H-loss (Middle English). See also the vocalization of the voiced velar fricative.
Voiced/voiceless splits.
The Old English fricatives had voiceless and voiced allophones, the voiced forms occurring in certain environments, such as between vowels, and in words originating from the Kentish dialect (like "vane", "vinew", "vixen", and "zink"), word-initially. In Early Middle English, partly by borrowings from French, they split into separate phonemes: . See Middle English phonology – Voiced fricatives.
Also in the Middle English period, the voiced affricate took on phonemic status. (In Old English, it is considered to have been an allophone of ). It occurred in Middle English not only in words like "brigge" ("bridge") in which it had been present in Old English but also in French loanwords like "juge" ("judge") and "general".
After the Middle English period, a fourth voiced fricative, , developed as a phoneme (alongside the voiceless ). It arose from yod-coalescence () in words like "measure", and from late French loanwords like "rouge" and "beige".
Dental fricatives.
As noted above, the Old English phoneme split into two phonemes in early Middle English: a voiceless dental fricative and a voiced dental fricative . Both continued to be spelt ⟨th⟩.
Certain English accents feature variant pronunciations of these sounds. These include fronting, where they merge with and (found in Cockney and some other dialects); stopping, where they approach and (as in some Irish speech); alveolarisation, where they become and (in some African varieties); and debuccalisation, where becomes before a vowel (found in some Scottish English).
Initial fricative voicing.
Initial fricative voicing is a process that occurs in some traditional accents of the English West Country, where the fricatives , , and are voiced to , , and when they occur at the beginning of a word. (Words beginning , like "three", develop instead.) In these accents, "sing" and "farm" are pronounced and . The phenomenon is well known as a stereotypical feature, but is now rare in actual speech. Some such pronunciations have spread from these dialects to become standard usage: the words "vane", "vat" and "vixen" all had initial in Old English ().
A similar phenomenon occurred in both German and Dutch.
Approximants.
Insertion and deletion of /j/ and /w/.
In parts of the west and southwest of England, initial may be dropped in words like "wool" and "woman"; occasionally, though, a may be inserted before certain vowels, as in "wold" for "old" and "bwoiling" for "boiling". Similarly, initial may be lost in words like "yeast" and "yes" (this has also been reported in parts of eastern England), and may be added in words like "earth" (making "yearth").
For the much more widespread deletion of in consonant clusters, see yod-dropping (and compare also yod-coalescence and yod-rhotacization). For the historical loss of in such words as "who" and "write", see pronunciation of "wh" and reduction of /wr/.
Realizations of /r/.
Old and Middle English was historically pronounced as an alveolar trill, . At some time between later Middle English and Early Modern English, it changed to an alveolar approximant, , in the standard accents. Some Scottish speakers, however, retain the original trilled ("rolled") .
Another possible realization of is the alveolar tap, . This is common (alongside ) in Scotland, and is also found in certain other accents, chiefly in positions between vowels or between a consonant and a vowel – this occurs, for example, in some Liverpool English and in some upper-class RP (this should not be confused with the tap pronunciation of /t/ and /d/, found especially in North America).
In most General American, is before a vowel, but when not followed by a vowel is generally realized as an r-colored vowel, , or as r-coloring on the preceding vowel. In many accents of English, including RP, is lost altogether when not followed by a vowel – for this, see rhoticity in English (and for related phenomena, linking and intrusive R). For vowel changes before , see English-language vowel changes before historic /r/.
A uvular realization of , the "Northumbrian burr", is used by some speakers in the far north of England.
A relatively recent innovation in the southeast of England, possibly originating from Cockney, is the use of a labiodental approximant, , for . To some listeners this can sound like a .
Developments involving /l/.
Velarization of in positions where there is no vowel following, producing a "dark L", is a phenomenon that goes back to Old English times. Today there is much variation between dialects as regards the degree and distribution of this velarization; see English phonology (sonorants).
In Early Modern English, in many words in which a dark followed the vowel or , the either disappeared or underwent vocalization, usually with some kind of diphthongization or compensatory lengthening of the preceding vowel. This affected:
As noted under some of the points above, may be reintroduced in some of the words from which it has been lost, as a spelling pronunciation. This happens sometimes in Irish English, where for example "Dundalk" may be pronounced (in standard English the ⟨l⟩ is silent).
The has also been lost in the words "would" and "should". The word "could" was never pronounced with ; its spelling results from analogy with the former words.
Modern L-vocalization (the replacement of "dark" with a non-syllabic vowel sound, usually similar to or ) is a feature of certain accents, particularly in London English and in near-RP speech that has been influenced by it ("Estuary English"), in some New York and Philadelphia speech, in the American South and African American Vernacular English, and in New Zealand English. Also in AAVE and some southern American accents, L-dropping may occur when the sound comes after a vowel and before a labial consonant in the same syllable, causing pronunciations like for "help" and for "self".
In some accents around Bristol, "intrusive L" is found, where an is inserted at the end of words ending in schwa, like "comma" and "idea". This is now somewhat stigmatized, but far from rare. The name "Bristol" itself was formerly "Bristow".
In some modern English accents, significant "pre-L breaking" occurs when follows certain vowels (, , and diphthongs ending or ). Here the vowel develops a centering offglide (an additional schwa) before the . This may cause "reel" to be pronounced like "real", and "tile", "boil" and "fowl" to rhyme with "dial", "royal" and "vowel". Wells considers this breaking to be a feature of Midwestern and New York English. Similar pre-L schwa-insertion may also occur after (in rhotic accents), leading to pronunciations like for "world".
Sound changes involving final consonants.
Final obstruent devoicing.
Final obstruent devoicing is the full devoicing of final obstruents that occurs for some AAVE speakers in Detroit where obstruents are devoiced at the end of a word. The preceding length of the vowel is maintained when the final obstruents are devoiced in AAVE: and for "big" and "bad".
Most varieties of English do not have full devoicing of final voiced obstruents, but voiced obstruents are partially devoiced in final position in English, especially when they are phrase-final or when they are followed by a voiceless consonant (for example, "bad cat" ). The most salient distinction between "bad" and "bat" is not the voicing of the final consonant but the duration of the vowel and the possible glottalization of final : "bad" is pronounced while "bat" is .
Final consonant deletion.
Final consonant deletion is the nonstandard deletion of single consonants in syllable-final position occurring for some AAVE speakers resulting in pronunciations like:
When final nasal consonants are deleted, the nasality is maintained on the preceding vowel. When voiced stops are deleted, the length of the preceding vowel is maintained. Consonants remaining from reduced final clusters may be eligible for deletion. The deletion occurs especially if the final consonant is a nasal or a stop. Final-consonant deletion is much less frequent than the more common final-cluster reduction.
Consonants can also be deleted at the end of a morpheme boundary, leading to pronunciations like for "kids".
References.
 ;templatestyles src="Reflist/styles.css" / ;
Bibliography.
 ;templatestyles src="Refbegin/styles.css" / ;