GNU Collaborative International Dictionary of English

Found one definition

  1.       
    
    Overboard , adv. Over the side of a ship; hence, from on board of a ship, into the water; as, to fall overboard.
    1913 Webster

    To throw overboard, to discard; to abandon, as a dependent or friend. -- To go overboard, to go to an extreme; to overdo; as, he went overboard at the buffet and got an upset stomach.

    1913 Webster
    +PJC