The word "覆盖" is formed by combining two characters, "覆" and "盖", each contributing to the overall concept of covering. "覆" carries meanings related to covering, overturning, or concealing, often with a sense of spreading over something, while "盖" refers to a cover, lid, or the act of placing a layer atop an object. When merged, these characters reinforce each other semantically, creating a compound that emphasizes the action of covering something completely, such as enveloping, shielding, or spanning over a surface, which aligns with the word's common translations like "to cover" or "coverage".