1. intransitive, in active present καταδύνω and middle καταδύομαι:—; to go down, sink, set , of the sun, ἠέλιος κατέδυ (Iliad by Homer); ἐς ἠέλιον καταδύντα till sun set , (Odyssey by Homer); of ships, to be sunk or rather to be disabled (see. infr. II), (Herdotus Historicus):—;of persons, καταδεδυκώς having popped down , (Aristophanes Comicus)

2. to go down into, plunge into , with accusative, καταδῦναι ὅμιλον, μάχην, δόμον, πόλιν (Homer); followed by a preposition, καταδυσόμεθ᾽ εἰς Ἀί̈δαο δόμους we will go down into . (Odyssey by Homer), etc.:—;with a notion of secresy, to insinuate oneself, steal into , (Plato Philosophus)

3. to slink away and lie hid , καταδύομαι ὑπὸ τῆς αἰσχύνης (Xenophon Historicus)

4. to get into, put on , τεύχεα (Homer)

5. Causal, to make to sink , Lat. submergere, ἐμὲ καταδύουσι τῷ ἄχει (Xenophon Historicus); mostly in aor1, τοὺς γαυλοὺς καταδύσας (Herdotus Historicus); καταδῦσαι ναῦν to cut it down to the water's edge, disable it, (Herdotus Historicus) (ML)