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to throw overboard
From The Collaborative International Dictionary of English v.0.48:
Overboard \O"ver*board`\, 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]