The idiom "焕然一新" is formed through a classical Chinese grammatical structure where "焕然" (huànrán) and "一新" (yī xīn) combine to create a vivid metaphorical meaning. "焕" means bright or shining, and the suffix "-然" turns it into an adverbial form meaning "in a bright/shining manner." "一新" literally means "entirely new." When paired, the phrase constructs an image where something becomes so bright and fresh that it appears completely renewed, thus figuratively describing a transformation into a brand-new state, whether for objects, atmospheres, or appearances.