The word "汩汩" is formed through reduplication, where the character "汩" is repeated to create an onomatopoeic effect that mimics the continuous sound of flowing water. The character "汩" itself is composed of the water radical (氵) on the left, denoting its association with water, and the component "曰" on the right, which historically contributed to its phonetic elements. This doubling emphasizes the repetitive nature of the sound, resulting in a word that directly imitates auditory perception without conveying abstract meaning.