가만 안 둘 거야

I won't let you get away with it

→ 가만
phrase Rare #14,262
I won't let you get away with it An informal threat meaning the speaker will take action against someone or will not let them off. The object is often understood from context.
KO: 다음에 또 내 물건을 훔치면 가만 안 둘 거야!
EN: If you steal my things again, I won't let you get away with it!

우릴 가만 안 둘 거 야

They’re not going to leave us alone.

— 카운터페이터 (2007)

한 번만 더 그러면 가만 안 둘 거 야

If you do that one more time, I won't let you get away with it.

— 인생 (1994)

안 그럼 가만 안 둘 거 야

Otherwise, I won't let you off the hook.

— 길 (1954)

가만 안 둘 거 야

I won’t let you get away with this.

— 길 (1954)

가만 안 둘 거 야!

I'm not going to let you get away with this!

— 인생은 아름다워 (1997)