1773 Jetsam is a term used to describe the wreckage of a ship or its cargo that has been cast off in order to lighten the load during an emergency. The term is derived from the Middle English word 'jetson, ' which means 'to throw overboard.' In this crossword, the solution for the term 1773 Jetsam is TEA, which is a reference to the Boston TEA Party of 1773. This event was a protest against the British government's taxation of TEA, and it resulted in the dumping of TEA into the Boston Harbor.