Her smile was as bright as the sun.
Meaning: Her smile was very happy and made people feel good, just like the sun makes people feel good when it shines brightly.
Choice of Words: Bright means full of light or shining brightly. Smile refers to the facial expression that shows happiness or pleasure. Sun is the star at the center of our solar system that provides light and heat. By comparing her smile to the sun, we emphasize how radiant and cheerful she appeared.
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