The word "溢出" is formed by combining the character "溢", which means "to overflow" and is structurally composed of the water radical "氵" attached to "益" conveying a sense of excess, with the character "出", meaning "to exit" or "to go out". This combination directly illustrates the concept of a liquid exceeding its confines and moving outward, resulting in the compound's meaning of "to spill out" or "to overflow".