with obj.
1- throw or drop (something) from an aircraft or ship（从飞机或船上）抛扔, 扔弃（物）：
six aircraft jettisoned their loads in the sea.
六架飞机把负重扔到了海里。
1.1
- abandon or discard (someone or something that is no longer wanted)抛弃, 废弃; 扔弃（无用的人或物）：
the scheme was jettisoned.
方案被放弃了。
词源
late Middle English (as a noun denoting the throwing of goods overboard to lighten a ship in distress)： from Old French getaison, from Latin jactatio（n-）, from jactare 'to throw' （see JET1）. The verb dates from the mid 19th cent.