Twinkle
Definition 1 of 5
Pro Tip 1/2
Constantly Changing
Use 'twinkle' for lights that change brightness rapidly, like stars or reflections. The necklace seemed to twinkle under the store lights.
Pro Tip 2/2
Natural Phenomena
'Twinkle' often describes natural light sources, not electronic or artificial ones. Fireflies twinkle as they fly through the summer garden.