This is the 16463rd most frequent Korean word.
빠진다
"빠진다" means "falls out," "drops," or "gets immersed" depending on context.
Here, '빠진다' means 'to drain out' or 'to flow away' in the context of water moving.
물이 빠진다.
The water drains.
In this context, '빠진다' refers to 'falling out', as in losing hair.
머리카락이 빠진다.
Hair is falling out.
In this example, '빠진다' figuratively means 'to fall into', used to signify becoming deeply involved emotionally.