An example of a living will is a document you right saying that you do not want to be put on life support or have other extreme measures taken to save your life.
Origin of living willsee will, noun
living will - Investment & Finance Definition
A document that lets the creator state his or her preferences about what type of medical treatment should be given in the event that he or she becomes terminally ill or severely injured and is unable to declare his or her intentions. A living will dictates whether the person is to be fed intravenously or to be put on a respirator, among other health-care directives.
living will - Legal Definition