ὑπολισθάνω
From LSJ
Τοὺς δούλους ἔταξεν ὡρισμένου νομίσματος ὁμιλεῖν ταῖς θεραπαινίσιν → He arranged for his male slaves to have sex with female slaves at a fixed price (Plutarch, Life of Cato the Elder 21.2)
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.