A term descriptive of goods which by the act of the owner have been voluntarily cast overboard from a vessel in a storm or other emergency to lighten the ship. 1 C. B. 113. Jetsam is where goods are cast into the sea and there sink and remain uuder water. 1 Bl. Comm. 292. Jetsam differs from “flotsam.” in this: that in the latter the goods float while in the former they sink and remain under water. It differs also from “ligan.”