flicker

Noun

• the act of moving back and forth

• North American woodpecker

• a momentary flash of light

Verb

• flash intermittently
  • The lights flicked on and off
    

• shine unsteadily
  • The candle flickered
    

• move back and forth very rapidly
  • the candle flickered
    

Related words

• Synonyms: 
  waver , flutter , spark , glint , flick , flitter , quiver