ὑπεξανάγεσθαι
From LSJ
Ξένοισι πιστοῖς πιστὸς ὢν γίγνου φίλος → Amicus esto fidus in fidum hospitem → Erweise treuen Fremden dich als treuer Freund
Greek > English (Woodhouse Verbs Reversed)
(see also: ὑπεξανάγομαι) put out secretly
Lexicon Thucydideum
clam solvere, proficisci, to depart secretly, set out, 3.74.3.