The word "闪闪" is a reduplicated adjective formed by repeating the single character "闪" (shǎn), which means "to glitter", "to flash", or "to sparkle". This process of reduplication is a common morphological feature in Chinese that intensifies the original meaning, transforming it from a simple action or state into a vivid, descriptive term for a continuous or repetitive shimmering effect. It evokes a sense of bright, intermittent light, as seen in common phrases like "闪闪发光" (shǎnshǎn fāguāng, to glitter and shine). The repetition also adds a rhythmic and expressive quality, making the description more lively and evocative.