1) Cast aside 2) Cast away 3) Cast out 4) Chuck out 5) Deep-six 6) Discard 7) Dispose 8) Eject 9) Fling 10) French word used in English 11) Put away 12) Throw as from an airplane 13) Throw away 14) Throw off the boat 15) Throw out 16) Throw overboard 17) Toss 18) Toss away 19) Toss out 20) Toss overboard Found on https://www.crosswordclues.com/clue/jettison
Jet'ti·son noun [ See Jetsam .] 1. (Mar. Law) The throwing overboard of goods from necessity, in order to lighten a vessel in danger of wreck. 2. See Jetsam , 1. Found on http://www.encyclo.co.uk/webster/J/9
Voluntary dumping either of cargo or of ship's material or stores overboard, to protect other property from a common danger. Found on https://www.encyclo.co.uk/local/21287