The word 左右 is formed through the direct juxtaposition of two fundamental, contrasting directional characters: 左 (zuǒ), meaning "left", and 右 (yòu), meaning "right". This pairing creates a new, composite concept that visually and conceptually encapsulates the idea of "both sides" or the entire horizontal spectrum from one side to the other. From this concrete spatial sense, it naturally extends to express the abstract notion of "approximately", as if something falls within the bounded area between a left and right limit. Thus, its formation is a logical and intuitive symbolic combination, where two opposites merge to define a unified range or scope.