High German consonant shift

The High German languages are subdivided into Upper German (green) and Central German (cyan), and are distinguished from Low German (yellow) and the Low Franconian languages. The main isoglosses – the Benrath and Speyer lines – are marked in green. This map shows the modern boundaries of the languages after 1945.

In historical linguistics, the High German consonant shift or second Germanic consonant shift is a phonological development (sound change) that took place in the southern parts of the West Germanic dialect continuum in several phases. It probably began between the 3rd and 5th centuries and was almost complete before the earliest written records in High German were produced in the 8th century. From Proto-Germanic, the resulting language, Old High German (henceforth, OHG), can be neatly contrasted with the other continental West Germanic languages, which for the most part did not experience the shift, and with Old English, which remained unaffected.


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