Your smile lights up my world.
Meaning: This sentence metaphorically expresses how the person's smile brings joy and brightness into the speaker's life, making it feel more positive and vibrant.
Choice of Words: Smile refers to the facial expression that typically conveys happiness or pleasure. Lights means to make something bright or illuminated. Up means to move or rise to a higher position. My refers to something belonging to the speaker. World refers to the planet Earth or the universe as a whole.
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Related Expressions