Noun
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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"
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a rapid change in brightness
a brief spark or flash
Verb
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emit or reflect light in a flickering manner
"Does a constellation twinkle more brightly than a single star?"
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gleam or glow intermittently
"The lights were flashing"