twinkle

Noun

• merriment expressed by a brightness or gleam or animation of countenance
  • he had a sparkle in his eye
    
  • there's a perpetual twinkle in his eyes
    

• a rapid change in brightness; a brief spark or flash

Verb

• emit or reflect light in a flickering manner
  • Does a constellation twinkle more brightly than a single star?
    

• gleam or glow intermittently
  • The lights were flashing
    

Related words

• Synonyms: 
  sparkle , spark , light , scintillation , sparkling , winkle , scintillate , flash , blink , wink