|Sound change and alternation|
Tone sandhi is a phonological change that occurs in tonal languages. It involves changes to the tones assigned to individual words or morphemes, based on the pronunciation of adjacent words or morphemes. This change typically simplifies a bidirectional tone into a one-directional tone. Tone sandhi is a type of sandhi, which refers to fusional changes, and is derived from the Sanskrit word for "joining."
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