The idiom "轻而易举" (qīng ér yì jǔ) is formed through a parallel four-character structure where each element contributes to a cohesive metaphorical meaning: "轻" (light in weight) and "易" (easy) describe the nature of the action, while "而" serves as a conjunctive particle meaning "and" or "thus", and "举" (to lift) provides the core verb; together, they create a vivid image of lifting something light and easy, figuratively conveying that a task is extremely simple and requires little to no effort.