The headword is the present active infinitive of the verb sxedia/zw, I do off-hand, on the spur of the moment, I invent, I improvise; cf. sigma 1770, sigma 1774, sigma 1775, sigma 1776, sigma 1777, sigma 1778, and see generally LSJ s.v.
[1] The first gloss is the present active infinitive of the verb e)ggi/zw, I bring near; see generally LSJ s.v. The second gloss is the same form, but from the verb plhsia/zw, I draw near to; see generally LSJ s.v. The verb form in the third gloss is the present middle infinitive of a)pofai/nw, I show forth, display, make known, represent; see generally LSJ s.v. Identical glossing in the Synagoge (sigma421) and Photius, Lexicon sigma894 Theodoridis; and cf. already Hesychius sigma2961 s.v. sxedia/zein. Adler also cites Boysen's Lexicon Seguerianum.
[2] Polybius fr. 46 Büttner-Wobst, already more fully at epsilon 3258 (end). The fragment is, however, unplaced. Against the present entry, Büttner-Wobst follows the prepositions of the fuller text: e)k th=s a)rxh=s, since the beginning (p. 520).
[In her critical apparatus Adler reports that ms F transmits the alternative spelling e)sxedia/zesqai.]