Definition of “jettison” - Learner’s Dictionary

jettison

verb [ T ] uk us /ˈdʒetɪsən/
NOT WANT/NEED

to get rid of something you do not want or need:

The station has jettisoned educational broadcasts.
MAKE LIGHTER

If an aircraft or a ship jettisons something, it throws it off to make itself lighter.

(Definition of “jettison” from the Cambridge Learner's Dictionary © Cambridge University Press)