Proto-Basque: *i=śtu
Meaning: spittle, saliva
Gipuzkoan: istu
High Navarrese: iztu, ixtu
Comments: An expressive form that phonetically matches PEC *šHătV, with the usual syncope < *i=śutu, or the like. This and other similar forms (txistu, listu, lixtu, etc.) are the results of much cross-contamination and blending with Bsq *tu ‘to spit’, *lić ‘saliva’, etc.
