From Longman Dictionary of Contemporary Englishoverboardo‧ver‧board /ˈəʊvəbɔːd $ ˈoʊvərbɔːrd/ adverb 1 TTWover the side of a ship or boat into the water One of the crew fell overboard and drowned. Man overboard (=said when someone falls off a boat)!2 → go overboard3 → throw something overboard
Examples from the Corpus
overboard• And what happened, that a girl should fall overboard?• But the flare was useless and I tossed it overboard.• I threw the decayed rattan overboard.• One error and he would have been torn loose and hurled overboard to be smothered by the driving spray.fell overboard• Eichenburger apparently slipped and fell overboard. 