Definitions
1.AdjectiveOf the motion of an aircraft, missile, or other flying object: continuously oscillating in a vertical plane due to the object pitching up and climbing, thus slowing down; then pitching down and descending, thus speeding up.
2.NounThe motion of an aircraft, missile, or other flying object continuously oscillating in a vertical plane due to the object pitching up and climbing, thus slowing down; then pitching down and descending, thus speeding up.