ὑπονομεύω
From LSJ
πρῶτον μὲν οὖν ὄστρεια παρὰ Νηρεῖ τινι ἰδὼν γέροντι φυκί ἠμφιεσμένα ἔλαβον ἐχίνους τ' ἐστὶ γὰρ προοίμιον δείπνου χαριέντως ταῦτα πεπρυτανευμένου → So first I spotted oysters wrapped in seaweed at the shop of some old Nereus, and sea urchins, which I bought; these were the appetizers for a delightfully managed dinner
English (LSJ)
A undermine, sap, Din. ap. Phot., Anon. ap. Suid.: τὴν στερεὰν γῆν J.BJ 7.2.2. 2 metaph., stir up by secret arts, stratagems, or intrigues, ὑ. Ῥωμαίοις πόλεμον D.H.3.23:—Pass., v.l. for -νοθ-, LXX 2 Ma.4.26.