The word "匆匆" is formed through the morphological process of reduplication, where the single character "匆" (cōng), which carries the core meaning of "haste" or "hurried," is duplicated. This repetition serves to intensify the adjective, transforming it from a simple descriptor of haste into a more vivid and expressive state of being "in a great rush" or "hurriedly." The reduplicated form creates a rhythmic, almost onomatopoeic quality that vividly evokes the fleeting, restless, and time-pressured feeling the word describes, making it a standard lexical item in Mandarin for expressing urgent busyness.