The word "增添" is formed by combining the characters "增" and "添", both meaning "to add" or "to increase". "增" incorporates the radical "土" (earth) suggesting expansion, with "曾" as a phonetic component, while "添" uses the water radical "氵" implying flow or augmentation, with "忝" as a phonetic element. Together, they create a compound where each character reinforces the same meaning, resulting in a term that denotes adding or increasing.