tonal sandhi
Definition - A type of sandhi that occurs in tonal languages.

According to the Wikipedia: "Most tonal languages have tone sandhi, in which the tones of words alter according to pre-determined rules. An example is the behavior of tone 3 in Mandarin Chinese. Mandarin has four tones, and in isolation tone 3 is often pronounced as a falling-rising tone. When a tone 3 occurs before another tone 3, however, it changes into tone 2 (a rising tone), and when occurring before any of the other tones, it is pronounced as a low falling tone, with no rise at the end” (Click for full article)

Shanghainese Tone Sandhi

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