The headword is aorist infinitive of the verb neike/w. Attested only here, it is perhaps quoted from somewhere, though the semantic distinction made in the gloss comes from Homeric scholia on another part of this verb; see the scholia to Iliad 7.161 (nei/kess') and to Iliad 24.29 (nei/kesse).
See also nu 284, nu 285, nu 286 and nu 287; cf. Apollonius' Homeric Lexicon and Photius nu93 Theodoridis (s.v. nei=kos), Etymologicum Gudianum s.v. neikw= and Etymologicum Magnum s.v. neikei/h|si. Hesychius nu226 s.v. nei/kesen accepts both meanings.