/'dʒetɪsn; `dʒɛtəsn/
v [Tn]
1 throw or eject (unwanted goods or material) from a ship in distress, or from an aeroplane, a spacecraft, etc 从遇难船中或从飞机、宇宙飞船等上投弃（物品）
*The first-stage vehicle is used to launch the rocket and is then jettisoned in the upper atmosphere. 第一级运载火箭是用来发射火箭的, 进入高层大气後即抛掉.
2 abandon or reject (sth that is not wanted) 放弃或拒绝（不想要的事物）
*to jettison a plan, an idea, a theory, etc 放弃一计划、想法、理论等.

v [T]
[Date: 1400-1500; Language: Anglo-French;Origin: getteson, from Old French getaison 'act of throwing', from getter; JET²]
to get rid of something or decide not to do something any longer
　The scheme was jettisoned when the government found it too costly.
to throw things away, especially from a moving plane or ship