Definition of jettison in English:

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Pronunciation: /ˈjedəsən/


[with object]
1Throw or drop (something) from an aircraft or ship: six aircraft jettisoned their loads in the sea
More example sentences
  • Inbound to Amberley the external drop tanks were jettisoned to reduce the overall weight for what became an uneventful landing.
  • Luckily it had jettisoned its bomb load and the crew baled out to safety and captivity.
  • The crew considered jettisoning the fuel bladders to regain control of the aircraft.
1.1Abandon or discard (someone or something that is no longer wanted): individuals are often forced to jettison certain attitudes and behaviors
More example sentences
  • He's already been in cell 118 for five hours and I decide, no matter what, I'm going to not have the same look on my face when I'm jettisoned.
  • Despite their doubts these men clung precariously to some idea of God, unwilling to jettison Him altogether.
  • He in fact wanted to jettison anyone who would stand up to his dictatorial tendencies.
dump, drop, ditch, discharge, throw out, unload, throw overboard
discard, dispose of, throw away/out, get rid of;
reject, scrap, abandon, drop
informal chuck (out), dump, ditch, ax, trash, junk, deep-six


The action of jettisoning something.
Example sentences
  • One is you can jettison the fuel if the airplane has a jettison system.
  • On board the battle ship Alkaline, Dex moved cautiously to his station near the jettison pods.
  • When the airplane was in a position to jettison the load, the pilot discovered the jettison switch guard had vibrated back to the closed position.


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 century.

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