Proto-IE: *kēwp-, *kwēp-
Meaning: to smoke, to boil
Hittite: kup- (I) 'planen, konspirieren' (Tischler 638 f)
Tokharian: A kāp-, B kāp- / kāw- (PT *kāp-) 'desire, crave, want' (Adams 151-152)
Old Indian: kupyati `to be moved, excited, agitated, be angry', kopa- m. `fury, passion, anger'; copati `to move'; kupāyú- `inclined to be angry'
Old Greek: kapnó-s m. `Rauch, Dampf, Dunst', hom. apò (dè psükhǟ̀n) ekápüssen `hauchte aus', kápüssen; kápo-s m. 'breath' Eust., Hsch., kápü-s id. Hsch.; 3 sg. eŋkáptei = eŋkapheî Hsch.; pf. 3 sg. kék[ē]phe `умереть' Hsch., hom. kekaph[ē]óta `aushauchend'
Baltic: *kwap-a- c., *kwep-ē̂- vb., Lith *kwē̃p- (*kwep-ja-) / Lett *kwē̂p- (2) vb., *kwē̂p-ē̂- (2) vb., *kwē̂p- (2) vb. intr. (Lett), *kwep- vb. intr., *kwap-ac., *kwap-u- adj., *kū̂p- (2) vb., *kū̂p-ē̂- (*kū̂p-a-) (2) vb., *kwē̂p-ia- (2) c., *kū̆p-[s]-in-[a]- m. Latin: cupio, -ere, cupīvī, -ītum `(heftig) begehren, wünschen', cuppēs, -ēdis m. `Naschmaul, Feinschmecker; vapor (OLat vapōs), -ōris m. `Dunst, Dampf, Hitze, Gluthauch; Erregung'; vapidus, -a `kahmig', vappa f., vapiō f. `kahmiger Wein'
Albanian: kapitem `atme schwer'
Russ. meaning: дымить(ся), кипеть
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