Definitionen
1.NounA destructive capacity that exceeds that needed to destroy an enemy; especially with nuclear weapons.
2.NounDestruction beyond what is necessary to kill, especially in murder.
3.NounAn unnecessary excess of whatever is needed to achieve a goal."24 hours of TV coverage of the US election verged on overkill.; Should I give you yet more homework, or would that be overkill?"
4.NounAn unnecessary excess of disposal because of too high criteria of inspection.
5.VerbTo destroy something with more (nuclear) force than is required.
6.VerbTo dispose of too many items because of too-high criteria of inspection.
7.VerbTo do something excessive to achieve a goal.