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生かしておく

keep alive

→ 生かす
phrase Rare #34,429
keep alive Means to let someone or something remain alive; おく adds the sense of leaving or keeping it in that state.
JA: 魚は生かしておくよ。
EN: I’ll keep the fish alive.

魚は生かしておくよ。

I'll keep the fish alive.

お前あいつらがあの娘を生かしておくと思うのかい？

Do you really think those guys would let that girl live?

— 天空の城ラピュタ (1986)

だが殺すより価値ある物があるなら何日かは生かしておくんだ

But if there's something more valuable than killing them, I'll keep them alive for a few days.

— ラスト、コーション (2007)