가슴이 멍들도록 그리운 사람 => one that I miss until my heart is bruised * 가슴이(my heart) 멍들도록(to the point of being bruised) 그리운(that I miss) 사람(person) * 멍들도록 = 멍들다 (be bruised) + 도록 (to the point of; until something happens) => until (it's) bruised.