turn and burn

This is military fighter pilots' jargon. When the last missile is fired or when the ordinance has been dropped on target, it is then time to quickly get out of the area-of-operations. The pilot turns his plane towards base and shifts into after-burner. This has since been adopted by the civilian community to mean when a decision has been made, especially if it was a poor decision, you forget about it and press on with the next phase of the mission.