Germanic sound laws

sound shift in the Germanic languages in which PIE voiceless stops become fricatives, PIE voiced stops become voiceless and PIE voiced aspirated stops become voiced stops or fricatives

pronunciation change in English between 1350 and 1700

linguistics phenomenon

historical sound change in Proto-Germanic in which voiceless fricatives following an unstressed syllable became voiced

sound change law in the family's language evolution

metaphony in Germanic languages, occurring around 450–500, in which vowels are raised or fronted when the following syllable contains /i(ː)/ or /j/; e.g. Engl. foot → feet

metaphonic process in late Proto-Germanic (c. 200)