godan verb (-su), transitive verb
make one's heart beat fast; cause to flutter; make pound
Transitive verb meaning to cause a racing heart or excited fluttering, typically from romantic excitement, anticipation, or thrill. Often used with 胸を or 心を.
彼の一言が私の胸をときめかせた。
His single remark made my heart flutter.
新しい恋はいつも心をときめかす
A new love always makes the heart pound.