Smiles light up the darkest days.
Meaning: Smiling can help people feel better even when they are going through a difficult time because it reminds them that there is still joy in the world.
Choice of Words: A darkest is a superlative adjective that means the most dark or gloomy. Day is a period of 24 hours, from sunrise to sunrise. When you say "Smiles light up the darkest days," it means that smiles can make even the most difficult times seem better.
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Related Expressions