ὑποπορεύομαι
From LSJ
ᾁδειν ἀμουσότερα Λειβηθρίων → sing worse than Leibethrans, sing worse than the people of Leibethra
English (LSJ)
A go secretly, Plu.Tim.18; διὰ τῶν ὑπονόμων Id.Cam. 5.
German (Pape)
[Seite 1229] dep. pass., heimlich hinzugehen, Plut. Tim. 18.