"flicker" in the noun sense
1. flicker, spark, glint
a momentary flash of light
North American woodpecker
3. waver, flutter, flicker
the act of moving back and forth
"flicker" in the verb sense
1. flicker, waver, flitter, flutter, quiver
move back and forth very rapidly
"the candle flickered"
2. flicker, flick
"The candle flickered"
3. flicker, flick
"The lights flicked on and off"
Source: WordNet® (An amazing lexical database of English)
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