matter of life and death

Noun

idiomatic

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

Japanese Meaning

命に関わる問題 / 生死にかかわる事柄 / 非常に切迫した、または重大な問題

Deciding whether to donate the heart was a matter of life and death for the recipient.

心臓を提供するかどうかを決めることは、受取人にとって生死にかかわる問題だった。

Sense（1）

Something whose outcome could result in either someone's survival or their death

Sense（2）

(idiomatic) An extremely urgent matter.

matters of life and death

（ plural ）