The reconstruction is not secure - obviously because of the expressive nature of the root. It occurs either in a simple form (stem 1: *-Vq-, stem 2: *qV-), reduplicated (Av. χaχ-) or with a suffixed *-d- (Cham., Tind., Botl.). Av. and Botl. have irregular consonants (in Av. - χ instead of h /Gudava 147 writes: χ:u-j-ze ?/; in Botl. χ: instead of χ; cf. also Cham. Gig. χ:u-d- ).