存亡攸關

a make-or-break matter / a matter of life and death

to exist / to deposit / to store / to keep / to survive

to live or die / to exist or perish

to die / to lose / to be gone / to flee / deceased

old variant of 亡[wang2]

distant, far / adverbial prefix

of great concern

mountain pass / to close; to shut; to turn off / to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc) / to concern; to involve