The headword is present indicative active, third person singular, of the verb sxedia/zw, I improvise, do off-hand, act with insufficient care; cf. epsilon 3258, sigma 1773, sigma 1774, sigma 1775, and see generally LSJ s.v. It is taken to be quoted from its earliest extant attestation (C4 CE): Gregory of Nazianzus, In Praise of Athanasius 21.5 (PG 35.1088.4).
[1] Likewise in Synagoge sigma420 and Photius, Lexicon sigma893 Theodoridis, and cf. Hesychius sigma2961 s.v. sxedia/zein (present active infinitive, to improvise).