An intransitive verb meaning to have one's heart beat faster; to flutter with joy, anticipation, or excitement.
彼の言葉に胸がときめいた。
My heart fluttered at his words.
新しいバッグを見るたびにときめく。
I get excited every time I see the new bag.
ステージに立った瞬間、彼女はときめいた。
The moment she stepped on stage, she felt her heart leap.