When to use rain streak in Korean
Korean: 빗줄기[ bis-jul-gi ]

When to use it
빗줄기 means the visible lines or streams of rain falling from the sky. People use it when they can clearly see the rain, especially when it looks strong or heavy. It is a common word for talking about rainy weather in daily life.
Example sentences
창문 밖으로 빗줄기가 보여요.
I can see streaks of rain outside the window.
학교에 가는 길에 빗줄기가 굵어졌어요.
The rain got heavier on the way to school.
친구가 빗줄기가 세다고 말했어요.
My friend said the rain was strong.
빗줄기가 갑자기 세져서 우리는 가게에 들어갔어요.
The rain suddenly got stronger, so we went into a shop.
버스를 기다리는데 빗줄기가 더 굵어졌어요.
I was waiting for the bus, and the rain got heavier.
여행 중에 빗줄기가 약해져서 다시 걸었어요.
During the trip, the rain became lighter, so we walked again.