to lay down one's life―give one's life―lose one's life―sacrifice one'slife 生命をなげうつ - 斎藤和英大辞典
of one'slife, to lose (it)
生命が失われる - EDR日英対訳辞書
One loseone'slife by falling from a cliff.
絶壁より堕ちてその命を喪(うしな)う - Wikipedia日英京都関連文書対訳コーパス
to lose a leg to save one'slife 小の虫を殺して大の虫を生かす - JMdict
to lose a leg to save one'slife 小の虫を殺して大の虫を助ける - JMdict
lose a leg to save one'slife 大の虫を生かして小の虫を殺す - JMdict
lose a leg to save one'slife 大の虫を生かして小の虫を殺せ - JMdict
As a member of the buke (samurai family), it is not disgraceful to loseone'slife by enemy hands.'
「武家である以上は敵の手にかかって命を落とすのは恥ではない。」 - Wikipedia日英京都関連文書対訳コーパス
During his life, he put a frame, which had a word "Yudan" (be off one's guard or inattention) on a wall, and always told his family "The only thing people should do is not to lose his sharpness."
生前、「油断」と書いた額をかけておき、家人に「人は只、油断の二字を戒むべきである。」と言っていた。 - Wikipedia日英京都関連文書対訳コーパス
He describes what should be kept in mind at a cavalry battle, saying, 'If he doesn't know the fact, he will lose his life soon; the brave warrior should be adept at horseback riding; 壮士等耳の底に留むべし; one should not laugh at what an old man says.'
「この故実を存ぜざれば、忽ち命を失うべきか。勇士はただ騎馬に達すべき事なり。壮士等耳の底に留むべし。老翁の説嘲哢すること莫れ」と武者の騎射戦の心得を述べている。 - Wikipedia日英京都関連文書対訳コーパス