Fairy dust, stars, Christmas lights, Hanukkah candles, freshly fallen snow, a lake when the sun hits it just right — all of these things sparkle. That means they shine with a bright, glistening, shimmering light.
Sparkle can also refer to joy or merriment. When you're having a really good time, your face will sparkle. As a verb, sparkle means to be lively and excited, or to be so brilliant at something that you shine above the rest. It can also describe something bubbly or foamy — like when you add soap to your bath to make the bathwater sparkle. Sparkle can also describe something that produces sparks — like a magic wand.