"twinkle" in the noun sense
1. twinkle, scintillation, sparkling
a rapid change in brightness a brief spark or flash
2. sparkle, twinkle, spark, light
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"
"twinkle" in the verb sense
1. flash, blink, wink, twinkle, winkle
gleam or glow intermittently
"The lights were flashing"
2. twinkle, winkle, scintillate
emit or reflect light in a flickering manner
"Does a constellation twinkle more brightly than a single star?"
Source: WordNet® (An amazing lexical database of English)
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