This is the 1130th most frequent Korean word.
떨어질
"떨어질" means "to fall" or "to drop."
떨어질 is used to indicate a physical falling or descending action.
과일이 나무에서 떨어질 것이다.
The fruit will fall from the tree.
떨어질 is used to describe a decrease or decline in a measurable quantity, such as a score.
시험에서 점수가 떨어질 것 같아요.
I think the score will drop in the exam.
떨어질 is applied metaphorically here to express emotional or relational distancing.