The word 轻松 is formed through the combination of two characters, 轻 (qīng), meaning "light" in weight, and 松 (sōng), meaning "loose" or "relaxed". Their union creates a conceptual metaphor: just as a physical burden feels light and a tense state becomes loose, the compound evokes the sensation of relief and lack of pressure. It is a semantic fusion where the tangible qualities of each character blend to express the abstract mental and emotional state of being "relaxed" or "at ease".