Comments: Some languages have irregularly preserved the affricate *c- (Kar., Botl., Bagv.; cf. also And. Kvankh., Zil. ce-b). This should be probably explained by Avar influence.
Derived from the same root is the PA adverb *ca-ru / *ca-nu (~-o-) 'together' (Kar. sa-ru, God. sa-nu, Cham. sa-n).