Sawi or Sawuy is a language

Language

Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication...

 of the Sawi people of the Trans–New Guinea phylum spoken in sago

Sago

Sago is a starch extracted in the spongy center or pith, of various tropical palm stems, Metroxylon sagu. It is a major staple food for the lowland peoples of New Guinea and the Moluccas, where it is called saksak and sagu. A type of flour, called sago flour, is made from sago. The largest supply...

 swamps of West Irian. Of the neighboring languages, it is most closely related to the Awyu languages to the east.

Sawi is an inflecting

Inflection

In grammar, inflection or inflexion is the modification of a word to express different grammatical categories such as tense, grammatical mood, grammatical voice, aspect, person, number, gender and case...

language and uses both inflections of the stem and suffixes to indicate person, number, and tense.