My hands are tied.
→   나도 어쩔수없어.

[예문]
Mother:Guys,guys! Hey,my hands are tied.Thieves get spanked.
            Just the way it works.   Unless....
            얘들아!엄마도 어쩔수가없어.도둑은 맞아야해.세상이그런거다.아니면.....

Boys:    Unless what?
           아니면요?

Mother:For the first-time offense, if you swear,cross your heart,that
           you will never,never steal again,and you write a letter of apology,
           I will let it slide.
           너희들이 초범이니까,앞으로 절대로 남의물건 훔치지않겠다고 진심으로
           맹세하고 사과편지쓴다면 넘어가주지.

Boys:      Okay,okay! We swear! We swear!
             좋아요!맹세해요!