The headword and first gloss are also in the Synagoge, Photius' Lexicon (mu354 Theodoridis), Hesychius mu1090, and the Anecdota graeca (ed. L. Bachmann) 300.5. They are present subjunctive forms of two "quasi-impersonal" verbs (Smyth, Gr. Gramm. §933, p. 260), me/testi and e)/cesti, whose meanings and grammar are not fully equivalent. Both govern a dative of the person involved. The headword also governs a genitive of the thing in which the person in the dative may be owed a share (Smyth, Gr. Gramm. §1467, p. 339). The gloss, however, has as its subject either a nominative or an infinitive (Smyth, Gr. Gramm. §§1984-85, p. 441) of what is permitted.
In the most likely sources the subjunctive owes its mood to being in a generic or indefinite relative clause (Smyth, Gr. Gramm. §2567b, p. 579): Aristophanes, Frogs 1163 (cf. the scholia ad loc.), where the character Aeschylus talks of "any man who belongs to a fatherland" (o(/tw| meth=| pa/tras, lit. "to whom a share in his fatherland is due"); and Plato, Laws 737B ("as many as have even a little share of sense", o(/sois nou= kai\ smikro\n meth=|).
[1] This is not a gloss of the headword, and must have slipped into this place through one of the not uncommon problems in the Suda filing system. It presumably belongs with me/teisin in the previous entry, mu 784.