The word 装修 is formed by combining two independent characters, each contributing a core action to create a unified concept. 装 (zhuāng) primarily conveys the idea of installing, fitting, or adorning something, like adding fixtures or finishes. 修 (xiū) carries the meaning of repairing, renovating, or making something orderly and complete. When paired, they logically sequence and encompass the full process of interior work: the "修" involves the foundational fixing, plastering, and structural preparation, while the "装" involves the subsequent fitting of elements like cabinets, flooring, and lighting. Together, they seamlessly merge into the single, comprehensive concept of "renovation" or "fitting-out", describing the entire act of making a space finished and habitable.