ὑπεξανάγεσθαι
From LSJ
ἡ τῆς παιδογονίας συνουσία → sexual intercourse for the purpose of bearing children
Greek > English (Woodhouse Verbs Reversed)
(see also: ὑπεξανάγομαι) put out secretly
Lexicon Thucydideum
clam solvere, proficisci, to depart secretly, set out, 3.74.3.