overkillPronunciation: /ˈəʊvəkɪl/Translate overkill | into French | into Italian | into Spanish Definition of overkill noun [mass noun] 1excessive use, treatment, or action:animators now face a dilemma of technology overkill 2the amount by which destruction or the capacity for destruction exceeds what is necessary:the existing nuclear overkilloverkill in other Oxford dictionaries Definition of overkill in the US English dictionary