1: κολυμβάω
(Strong's #2860 — Verb — kolumbao — kol-oom-bah'-o )

"to dive, plunge, into the sea," hence, "to swim," occurs in Acts 27:43 . Cp. kolumbethra, "a pool."

2: ἐκκολυμβάω
(Strong's #1579 — Verb — ekkolumbao — ek-kol-oom-bah'-o )

"to swim out of" (ek), occurs in Acts 27:42 .