Himalayan Linguistics

Uipo, also called Khoibu, is an underdescribed Tibeto-Burman language spoken by around 1800 people in the Chandel district of Manipur. Uipo has four lexical tones: a high falling tone, a low level tone, a low falling tone and a high level tone. These are called Tone 1, Tone 2, Tone 3 and Tone 4 respectively. When tones are combined within one word, there are two sandhi rules that explain how the tones change. This article will look at the different context where tone sandhi occurs, focusing on compounds, possessive constructions, and nominal attribution. For instance, a noun that start with a Tone 1 or a Tone 2 syllable will get a Tone 4 when following a Tone 2 possessive prefix. There are examples of minimal pairs that become homonymic in certain morphological contexts, and these are used to illustrate that the tonal category of a given words has really changed. Interestingly, what otherwise seem like phonological rules have some specific lexical exceptions. For instance, the word toŋ₁kan₂ does not change its tone in contexts where it is expected. The sandhi rules are argued to be  evidence that Uipo has a four-tone system, as opposed to what has been proposed by some previous accounts of the language which have described it as having only three.