• (countable) The action of jettisoning items.
  • (uncountable) Collectively, items that have been or are about to be ejected from a boat or balloon.


  • To let go or get rid of as being useless or defective; discard.
  • To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.

    "The jettisoning of fuel tanks."

  • "The ballooners had to jettison all of their sand bags to make it over the final hill."

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