가슴이 뛰어요 · 가슴이 뛰는 (+noun)
one's heart races, to be thrilled (with joy or anticipation)
Example
내일 첫 해외여행을 간다고 생각하니 가슴이 뛰어요.
Just thinking about my first trip abroad tomorrow makes my heart race.
Word parts
뛰다 'to jump, to run': the heart beats fast with excitement.
Good to know
Mostly positive excitement; 가슴이 두근거리다 is similar. For sudden fear, use 가슴이 철렁하다.