From ekballo; ejection, i.e. (specially) a throwing overboard of the cargo -- + lighten the ship.
see GREEK ekballo
a. a casting out.
b. specifically, the throwing overboard of goods and lading whereby sailors lighten a ship in a storm to keep her from sinking (Aeschylus sept. 769; Aristotle, eth. Nic. 3, 1, 5 (p. 1110{a}, 9); Lucian, de merc. cond. 1): ποιεῖσθαι ἐκβολήν, Latinjacturam facere, to throw the cargo overboard, Acts 27:18; with τῶν σκευῶν added, the Sept. Jonah 1:5; τῶν φορτιων, Pollux 1, 99, p. 70, Hemsterh edition.