Life-or-death Definition

līfôr deth
adjective
Having death as a possible result.
A life-or-death struggle.
Webster's New World
So extremely important as to be crucial.
A life-or-death decision.
Webster's New World
Good camoflouge is life-of-death for many animals in the wild.
Wiktionary

(idiomatic) Of critical importance to the success of a particular endeavor.

Obtaining financing was a life-or-death matter for the research.
Wiktionary
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life-or-death