1. mercy killing - Noun
2. mercy killing - Verb
the act of killing someone painlessly (especially someone suffering from an incurable illness)
Source: WordNetmercy-killing
Animal Mother decides to allow a mercy killing only if Joker performs it. Source: Internet
Legal status main West's Encyclopedia of American Law states that "a 'mercy killing' or euthanasia is generally considered to be a criminal homicide" The legal-dictionary. Source: Internet
Is the city rushing this vote to ensure a mercy killing? Source: Internet
Without telling you every detail, let me add that the play is also about the possibility of mercy killing. Source: Internet