嗦嗦 is an onomatopoeia used to describe the sound of trembling, shivering, or rustling, often in literary or descriptive writing. It intensifies the auditory effect of the action, such as in 冷得嗦嗦发抖 ('shivering from cold') or 树叶嗦嗦作响 ('leaves rustling'). This reduplicated form is typical of Chinese onomatopoeia for repeated or continuous sounds.