闪烁 is a verb meaning 'to flicker' or 'to glimmer' — describing rapid, irregular light emission, like stars twinkling in the night sky, fireflies blinking, or distant lights shimmering through mist. The first character 闪 (shǎn) means 'to flash' or 'to dart', suggesting sudden, brief movement; the second 烁 (shuò) means 'to shine brightly' or 'to gleam', emphasizing luminosity. Together, they form a reduplicative compound that conveys rhythmic, intermittent brightness rather than steady light.

This word is commonly used to describe natural phenomena (e.g., stars, fireflies, candle flames), electronic displays (e.g., LED indicators), or even metaphorical 'flickering' of emotions or thoughts — though the latter is more literary. It often appears in descriptive writing and spoken descriptions of visual scenes, especially those evoking delicacy, fragility, or quiet beauty. Unlike the neutral term 亮 (liàng, 'to be bright'), 闪烁 carries a sense of instability or transience in its glow.