Development of diphthongs

The development of vowels in Early OE consisted of the modification of separate vowels, and also of the modification of entire sets of vowels.

The PG short [a] and the long [a:], which had arisen in West and North Germanic, underwent similar alterations in Early OE: they were fronted, and in the process of fronting, they split into several sounds. The principal regular direction of the change – [a] > [æ] and [a:] > [æ:] – is often referred to as the fronting or palatalisation of [a, a:]. The other directions can be interpreted as positional deviations or restrictions to this trend: short [a] could change to [o] or [ā] and long [a:] became [o:] before a nasal; the preservation of the short [a] was caused by a back vowel in the next syllable.

The PG diphthongs – [ei, ai, iu, eu, au] – underwent regular independent changes in Early OE; they took place in all phonetic conditions irrespective of environment. The diphthongs with the i -glide were monophthongised into [i:] and [a:], respectively; the diphthongs in –u were reflected as long diphthongs [io:], [eo:] and [ea:].

Assimilative vowel changes: Breaking and Diphthongization

The tendency to assimilative vowel change, characteristic of later PG and of the OG languages, accounts for many modifications of vowels in Early OE. Under the influence of succeeding and preceding consonants some Early OE monophthongs developed into diphthongs. If a front vowel stood before a velar consonant there developed a short glide between them, as the organs of speech prepared themselves for the transition from one sound to the other. The glide, together with the original monophthong formed a diphthong. The front vowels [i], [e] and the newly developed [æ], changed into diphthongs with a back glide when they stood before [h], before long (doubled) [ll] or [l] plus another consonant, and before [r] plus other consonants, e.g.: [e] > [eo] in OE deorc, NE dark. The change is known as breaking or fracture. Breaking produced a new set of vowels in OE – the short diphthongs [ea] and [eo]; they could enter the system as counterparts of the long [ea:], [eo:], which had developed from PG prototypes. Breaking was unevenly spread among the OE dialects: it was more characteristic of West Saxon than of the Anglian dialects. Diphthongisation of vowels could also be caused by preceding consonants: a glide arose after palatal consonants as a sort of transition to the succeeding vowel. After the palatal consonants [k’], [sk’] and [j] short and long [e] and [æ] turned into diphthongs with a more front close vowel as their first element, e.g. OE sc æmu > sceamu (NE shame). In the resulting diphthong the initial [i] or [e] must have been unstressed but later the stress shifted to the first element, which turned into the nucleus of the diphthong, to conform with the structure of OE diphthongs. This process is known as “diphthongisation after palatal consonants”.

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