noun
jettisoned cargo; jetsam
Nautical term for cargo intentionally thrown overboard to lighten a ship in distress. Rare in everyday conversation; mainly encountered in historical or maritime contexts.
嵐の中で船長は打ち荷を命じた。
The captain ordered the jettisoning of cargo during the storm.
海岸に打ち荷が流れ着いた。
Jetsam washed ashore on the beach.
Compound of 打ち (uchi, 'striking' or 'throwing') and 荷 (ni, 'cargo'). The exact historical derivation is uncertain, but the term is conventionally associated with the act of throwing cargo overboard.