Chuckles lighten mood.
Meaning: This means that the sound of chuckling can improve someone's mood.
Choice of Words: Chuckles are soft, low sounds of laughter. Lighten means to make something lighter or less burdensome. Mood is a person's emotional state. When you put them together, "Chuckles lighten mood" means that the sound of chuckling can make someone's emotional state lighter or less burdensome.
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