‘骨碌’ (gū lu) is an onomatopoeic verb that imitates the sound and motion of something round rolling smoothly—like a ball, a stone, or even an animal’s body turning over. Though the characters 骨 (bone) and 碌 (busy, common) individually bear no direct connection to rolling, together they form a fixed reduplicative expression whose meaning emerges solely from sound symbolism, not character semantics. It often conveys lightness, spontaneity, or sudden movement.

This word is especially common in descriptive storytelling, children’s literature, and spoken language when depicting small-scale, casual rolling actions—such as a marble slipping off a table, a squirrel tumbling down a log, or a child rolling playfully on grass. It carries a vivid, slightly playful tone and is rarely used in formal writing. Unlike standard verbs like 滚 (gǔn), ‘骨碌’ emphasizes auditory texture and physical immediacy rather than force or direction.