ὑπολισθάνω
From LSJ
Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
English (LSJ)
and (later) ὑπ-ολισθαίνω,
A slip or slide slightly, Hp. Art.5, Poll.2.15: metaph., ὑ. εἰς ὕπνον Ael.VH2.35; εἰς τὰς τερψεις Luc.Dem.Enc.12.