ὑπεξανάγεσθαι
From LSJ
οὕτω τι βαθὺ καὶ μυστηριῶδες ἡ σιγὴ καὶ νηφάλιον, ἡ δὲ μέθη λάλον → silence is something profound and mysterious and sober, but drunkenness chatters
Greek > English (Woodhouse Verbs Reversed)
(see also: ὑπεξανάγομαι) put out secretly
Lexicon Thucydideum
clam solvere, proficisci, to depart secretly, set out, 3.74.3.