반짝반짝 + 빛나다 / 빛이 나다
twinkling, sparkling, glittering
Example
밤하늘에 별이 반짝반짝 빛나요.
The stars are twinkling in the night sky.
Word parts
의태어 (manner word) for small lights flickering on and off. Its dark-vowel partner 번쩍번쩍 is for big, strong flashes, like lightning.
Good to know
Pronounced [반짝빤짝]: the second ㅂ becomes tense after ㄱ. Verbs: 반짝이다 and 반짝거리다 'to twinkle, to sparkle'.