Read the dictionary definition of twinkle. All definitions for this word.
1. merriment expressed by a brightness or gleam or animation of countenance
1. he had a sparkle in his eye
2. there's a perpetual twinkle in his eyes
2. a rapid change in brightness; a brief spark or flash
3. gleam or glow intermittently
1. The lights were flashing
4. emit or reflect light in a flickering manner
1. Does a constellation twinkle more brightly than a single star?