Alternative form of life-or-death

Of critical importance to the survival of a living organism. / Having death as a possible or even likely outcome; perilous. / Of critical importance to the success of a particular endeavor.

Something whose outcome could result in either someone's survival or their death / (idiomatic) An extremely urgent matter.

plural of matter of life and death

The state of afterlife; existence in heaven.

Alternative form of matter of life and death

plural of matter of life or death