/ ˈdʒetɪsn; NAmE / verb [ vn ]
1.
to throw sth out of a moving plane or ship to make it lighter :
to jettison fuel
2.
to get rid of sth/sb that you no longer need or want
SYN discard :
He was jettisoned as team coach after the defeat.
3.
to reject an idea, belief, plan, etc. that you no longer think is useful or likely to be successful
SYN abandon
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WORD ORIGIN
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, frequentative of jacere to throw. The verb dates from the mid 19th cent.