overkill Syllabification: (o·ver·kill)Pronunciation: /ˈōvərˌkil/Translate overkill | into French | into Italian | into Spanish Definition of overkill noun the amount by which destruction or the capacity for destruction exceeds what is necessary:the existing nuclear overkill excessive use, treatment, or action; too much of something:animators now face a dilemma of technology overkilloverkill in other Oxford dictionaries Definition of overkill in the British & World English dictionary