Some form of the headword verb is used frequently in Homeric formulae for the preparation of meat for a feast. This particular form is third person singular, imperfect indicative active (could be aorist, but the gloss suggests otherwise), with the nu-moveable. It occurs at Iliad 20.479 (web address 1), Iliad 9.210 (web address 2), and Odyssey 14.75 (web address 3). The entry may derive from commentary to one of these passages.
cf. generally under pi 1460. There as well as here, the glossing verb soubli/zein survives into modern Greek (and English) as souvlaki.