잘못을

wrongdoing; mistake

→ 잘못
phrase Rare #15,971
wrongdoing; mistake 잘못 means a mistake, fault, or wrongdoing, and 을 marks it as the object of the verb. The exact English translation depends on context.
KO: 자신의 잘못을 솔직하게 인정했어요.
EN: I honestly admitted my mistake.

주님, 저희의 잘못을 용서하소서

Lord, forgive us our sins.

— 헌팅시즌 (2025)

스위니 씨는 라퍼티 부인 에게 잘못을 했어

Mr. Sweeney did something very wrong to Mrs. Rafferty.

— 보리밭을 흔드는 바람 (2006)