- the statement of the regular pattern of consonant correspondences presumed to represent changes from Proto-Indo-European to Germanic, according to which voiced aspirated stops became voiced obstruents, voiced unaspirated stops became unvoiced stops, and unvoiced stops became unvoiced fricatives: first formulated in 1820–22 by Jakob Grimm, though the facts had been noted earlier by Rasmus Rask.
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- the rules accounting for systematic correspondences between consonants in the Germanic languages and consonants in other Indo-European languages; it states that Proto-Indo-European voiced aspirated stops, voiced unaspirated stops, and voiceless stops became voiced unaspirated stops, voiceless stops, and voiceless fricatives respectively
formulated by Jakob Grimm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012