The word "漫漫" is formed by duplicating the character "漫", which is a phonetic-semantic compound consisting of the water radical (氵) on the left, implying concepts like fluidity or expansiveness, and the component "曼" on the right, primarily providing phonetic guidance. This repetition creates a disyllabic word that emphasizes and extends the original meaning, often denoting something continuous, endless, or vast, such as in descriptions of time or space.