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flicker

noun
  1. the act of moving back and forth
    flutter
  2. North American woodpecker
  3. a momentary flash of light
    glintspark
verb
  1. move back and forth very rapidly
    “the candle flickered”
    flutter
  2. flash intermittently
    flick
  3. shine unsteadily
    “The candle flickered”
    flick