柯林斯詞典mercy killing (mercy killings) 1. N-VAR A mercy killing is an act of killing someone who is very ill, in order to stop them from suffering any more pain. 安樂(lè)死 返回 mercy killing劍橋詞典the act of killing someone who is very ill or very old so that they do not suffer any more 安樂(lè)死 返回 mercy killing