GNU Collaborative International Dictionary of English
Found one definition
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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