This is the 13824th most frequent Korean word.
막아달라
"Please block" or "Please stop."
In this sentence, '막아달라' is used to mean 'block' or 'prevent,' which is requested by asking someone to close the door to stop the wind from entering.
문이 열린 채로 바람이 들어올까 봐 문을 막아달라 요청했다.
They asked to block the door to prevent wind from coming in while it was open.
Here, '막아달라' is used to ask someone to 'block' or 'cover' the window to prevent rain from entering the room.
비가 너무 많이 들어서 창문을 막아달라 부탁했다.
They requested to block the window because too much rain was coming in.
In this context, '막아달라' means 'block' and is used to request an action to make sure cars cannot access the road.