This is the 15485th most frequent Korean word.
벽을
"벽을" means "wall" (object form).
벽을 is the object of the verb 칠했다 (painted), representing the wall being painted.
나는 벽을 칠했다.
I painted the wall.
벽을 serves as the object of the verb 넘어갈 (to cross over), referring to the wall that needs to be crossed.
우리는 벽을 넘어갈 방법을 찾았다.
We found a way to cross the wall.
벽을 acts as the object of the verb 느끼고 (felt), indicating the wall that was sensed.