The word "难受" is formed through a direct and visceral conceptual blend. It combines "难" (nán), meaning difficult or hard, with "受" (shòu), meaning to bear or to endure. The compound doesn't just add these ideas together; it creates a new, immediate sensation of an internal state that is hard to bear, evoking the physical and emotional strain of carrying a heavy, uncomfortable burden within oneself. It translates the abstract feeling of distress into the concrete image of something oppressive being difficult to withstand.