living will

/L IH1 V IH0 NG W IH1 L/
noun
  1. 1

    A document, made by a person when still legally fit to do so, which provides clear instructions or principles to be employed by a surrogate decision-maker, such as expressing a desire to be allowed to die instead of being kept alive by artificial means, in the event of being severely disabled or suffering from a terminal illness.

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Source: https://en.wiktionary.org/wiki/living%20will