σύμφημι
Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
English (LSJ)
fut.
A -φήσω Pl.Prt.357b, al.: aor. 1 συνέφησα Id.R.342e, Sph.236d, al.: aor. 2 συνέφην freq. in Pl. (v. infr.), Elean συνέφα Schwyzer 416.5:—assent, approve, or agree fully, A.Pr.40, S.Ph. 1310, etc.; ξύμφημι κἀγώ Id.El.1257; ξ. δή σοι Id.Aj.278, cf. E. Hipp.266 (anap.), Pl.Ti.72d, etc. 2 c. acc. rei, concede, agree to, grant, ταῦτα . . πάντες ἄρα συνέφασαν Id.Smp.177e, cf.Sph.247a, Prt. 330d, X.An.5.8.8, etc.: hence abs., σύμφημί (σοι) I grant you, Pl.R. 403c,608b; freq. in Platonic dialogue, σύμφαθι ἢ ἄπειπε say yes or no, ib.523a, cf.Grg.500e; συνέφη Id.Phd.102d, al. 3 c. acc. et inf., agree that... S.OT553, Pl.Lg.831b, etc.; σ. τῷ νόμῳ ὅτι καλός, = σ. τὸν νόμον καλὸν εἶναι, Ep.Rom.7.16. 4 c. inf. fut., promise, X.HG5.2.5.
