Noah Webster's Dictionary (adv.) Over the side of a ship; hence, from on board of a ship, into the water; as, to fall overboard.

Multi-Version Concordance Overboard (5 Occurrences) Acts 27:18 As we labored exceedingly with the storm, the next day they began to throw things overboard. (WEB ASV DBY RSV NIV) Acts 27:19 and, on the third day, with their own hands they threw the ship's spare gear overboard. (WEY NAS NIV) Acts 27:38 After eating a hearty meal they lightened the ship by throwing the wheat overboard. (WEY) Acts 27:43 But the centurion, desiring to save Paul, stopped them from their purpose, and commanded that those who could swim should throw themselves overboard first to go toward the land; (WEB WEY ASV NAS RSV NIV) Jonah 1:15 So they took up Jonah, and threw him into the sea; and the sea ceased its raging. (See NIV)