Moving or shining with a quick, unsteady light that appears and disappears; wavering in brightness or intensity.
From 'flicker' (possibly onomatopoetic origin, related to Old English 'flacorian'). The present participle 'flickering' has been used since at least the 1600s, describing flames, candles, and later electric lights.
Flickering light at certain frequencies can actually trigger seizures in people with photosensitive epilepsy—video games and TV shows now include warnings. It's why old CRT monitors (before flat screens) flickered at 60Hz, which was chosen specifically to avoid dangerous frequencies!
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