ἀπονήχομαι
From LSJ
Ἀναβάντα γὰρ εἰς τὴν ἀκρόπολιν, καὶ διὰ τὴν ὑπερβολὴν τῆς λύπης προσκόψαντα τῷ ζῆν, ἑαυτὸν κατακρημνίσαι → For he ascended the acropolis and then, because he was disgusted with life by reason of his excessive grief, cast himself down the height
English (LSJ)
A escape by swimming, swim away, Plb.16.3.14, Luc. Pisc.50: metaph., τοῦ σώματος escape from .., Plu.2.476a; πόλεως J.BJ2.20.1.
German (Pape)
[Seite 316] wegschwimmen, so daß man entkommt, πρὸς τὴν ναῦν Pol. 16, 3; Luc. Pisc. 50; oft Plut.