Proto-IE: *k'yāupe- (-ph-)
Meaning: to rot
Old Indian: śopha- m. 'intumescence, tumour'
Old Greek: sǟ́pomai̯, pf. sésǟpa, aor. sapē̂nai̯ `verfaulen, faul werden', sǟ́pō, aor. sǟ̂psai̯, va. sǟptó- `faulen machen', sǟ̂psi-s `Fäulnis, Gährung', sǟ́p-s, gen. sǟpós f.`fauliges Geschwür'; sǟ́pǟ `Fäulnis', *sǟpetó-s: sēpetoû `rotting' Hsch.; sapró- `faul, verfault, ranzig'; sǟpedṓn, -dónos f. `Fäulnis'
Russ. meaning: гнить
References: WP I 500 (differently in Pok.)
Comments: About *k'y- see *k'yaur-.