Smile brightens day.

Meaning: This means that the act of smiling can make a day seem brighter or more cheerful.

Choice of Words: Smile is a noun that refers to the act of turning up the corners of one's mouth in an expression of pleasure or happiness. Brightens is a verb that means to make something brighter or more cheerful. Day is a noun that refers to the period of time from sunrise to sunset.

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Related Expressions