闪烁
shǎnshuò · HSK 7
twinkle
✨ 闪 = flash/lightning radical, 烁 = fire + sound 'shuò'; two fire-bright words for light that comes and goes
闪 — door 門 + person 人
闪 (traditional 閃) is an associative compound showing a person 人 inside a doorway 門, suggesting someone darting in or peeking out. From this image of sudden, brief movement came the meanings 'flash,' 'dodge,' and 'lightning.' The simplified form keeps the same structure with the reduced 门.