The word "悸动" is formed by combining the character "悸", which denotes palpitation and is itself composed of the heart radical "忄" for meaning and the phonetic component "季" for sound, with the character "动", meaning movement, formed from the component "力" indicating force and "云" serving as a phonetic element. Together, they create a compound word literally meaning "palpitation-movement" to describe a throbbing or quivering sensation, often from emotional excitement.