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Grimm's lawGrimm's law (also known as the [First] Germanic Sound Shift) was the first non-trivial systematic sound change ever to be discovered; its formulation was a turning-point in the development of linguistics, enabling the introduction of rigorous methodology in historical linguistic research. The "law" was discovered about 1820 by Jakob Grimm, the younger of the Brothers Grimm. It establishes a set of regular correspondences between early Germanic stops and fricatives (see: Consonant) and the stop consonants of certain other Indo-European languages (Grimm used mostly Latin and Greek for illustration). As formulated nowadays, Grimm's Law describes the development of inherited Proto-Indo-European (PIE) stops in Proto-Germanic (PGmc, the common ancestor of the Germanic branch of the Indo-European family). It consists of three parts (the presentation below is simplified for the sake of clarity):
The Germanic "sound laws", combined with regular changes reconstructed for other Indo-European languages, allow one to define the expected sound correspondences between different branches of the family.
For example, Germanic (word-initial) *b- corresponds regularly to Latin *f-, Greek ph-, Sanskrit bh-, Slavic, Baltic or Celtic b-, etc., while Germanic *f- corresponds to Latin, Greek, Sanskrit, Slavic and Baltic p- and to zero (no initial consonant) in Celtic. The former set goes back to PIE *bh- (faithfully reflected in Sanskrit and modified in various ways elsewhere), and the latter set to PIE *p- (shifted in Germanic, lost in Celtic, preserved in the other groups mentioned here).
Grimm also discovered another ("Second") consonant shift, which accounts for the consonant system of High German. It did not operate in the remaining Germanic languages, which meant that e.g. the English system of stops and fricatives is more archaic (closer to Proto-Germanic) than that of Modern German.
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