Jettison means to push to the side or toss away. If a boat is leaking or an airplane is running out of fuel, you can buy more time by jettisoning cargo, or throwing it overboard.
The word jettison — dating, in its nautical meaning, from the 15th century in English — is commonly used figuratively as well as literally. You can jettison a friendship or an attitude. During the month that the Winter Olympics are aired on TV, figure-skating fans across the country jettison homework and other responsibilities in order to watch.