v. & n.
v.tr. 1 a throw (esp. heavy material) overboard to lighten a ship, hot-air balloon, etc. b drop (goods) from an aircraft. 2 abandon; get rid of (something no longer wanted).
n. the act of jettisoning.
[ ME f. AF getteson, OF getaison f. L jactatio -onis f. jactare throw: see JET(1) ]