Reconstructed for the PEC level. Correspondences are regular. The word
very probably belongs to an early layer of Indo-European loanwords in
EC: cf. Osset. kūvɨn (kʷɨv-d) 'to pray', Old Indian kopa- 'anger,
irritation' etc. (Indo-Iran. *kwap- / *kup-, IE *kwepǝ-).