Proto-Tsezian: *c[ɨ]q- / *c[ɨ]q̇-
Meaning: sour
Tsezi: ceq̇(i)ju
Ginukh: ceq̇q̇u
Khvarshi: caqu
Inkhokvari: caqqu
Comments: PTsKh *c[ɨ]qV-ju / *c[ɨ]q̇V-ju. The vowel correspondence is irregular (unclear is -a- in Khvarsh. and Inkh.). The variation *q/*q̇ is rather typical for reflexes of PEC glottalized consonants in "tense" words.