Dictionary

life–and–death

adjective

: extremely important and serious especially because your survival or life may depend on success

Full Definition of LIFE-AND-DEATH

:  involving or culminating in life or death :  vitally important as if involving life or death

Variants of LIFE-AND-DEATH

life–and–death also life–or–death

First Known Use of LIFE-AND-DEATH

1822

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