This is the 5418th most frequent Korean word.
뛸
"뛸" means "will run" or "to run" (future tense/conjugated form).
In this sentence, '뛸' is used to mean 'to run' or 'jump', indicating physical movement in the playground context.
아이들이 놀이터에서 신나게 뛸 준비를 하고 있어요.
The children are excitedly preparing to run at the playground.
Here, '뛸' metaphorically expresses the sensation of the heart leaping, reflecting joy or excitement.
시험 결과를 듣고 기뻐서 마음이 뛸 것 같았어요.
Upon hearing the exam results, I felt my heart was about to leap with joy.
In this case, '뛸' metaphorically emphasizes the feeling of infinite joy or boundless energy.