Humor lightens mood.
Meaning: This means that the quality of being amusing or comical can make a person's emotional state lighter or less serious. It's like saying, Something funny can improve your mood.
Choice of Words: Humor is a noun that means the quality of being amusing or comical. Lightens is a verb that means to make something lighter or less serious. Mood is a noun that means a person's emotional state.
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Related Expressions