The word 掷地有声 is formed by combining four characters: 掷 (throw), 地 (ground), 有 (have), and 声 (sound), creating a literal sequence of "throw to the ground and have a sound". This construction visually depicts an action and its immediate result, originating from an anecdote where well-crafted writing was metaphorically described as so substantial that it would produce a sound upon impact, thus conveying the meaning of forceful and impactful expression.