jettison
/ˈdʒetɪsn; `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.