Meaning

• (collective) Items that have been or are about to be ejected from a boat or balloon.

• The action of jettisoning items.

Meaning

• To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load.

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

• To let go or get rid of as being useless or defective.