τὸ ἐμόν γ' ἐμοὶ λέγεις ὄναρ → you are telling me what I know already, you are telling me my own dream
προϊέναι:I inf. к προΐημι.II inf. к πρόειμι II.
(see also πρόειμι, προίημι): fling away, leave in the lurch
