jet ‧ ti ‧ son /ˈdʒetəs ə n, ˈdʒetɪs ə n, -z ə n/ BrE AmE verb [transitive]
[ Date: 1400-1500 ; Language: Anglo-French ; Origin: getteson , from Old French getaison 'act of throwing' , from getter ; ⇨ ↑ jet 2 ]
1 . to get rid of something or decide not to do something any longer:
The scheme was jettisoned when the government found it too costly.
2 . to throw things away, especially from a moving plane or ship