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The definition of a grin is a smile or expression of happiness. A happy smile on your face is an example of a grin. To grin is defined as to smile or make an expression that indicates great happiness. When you feel very happy and you smile, this is an example of a situation where you grin. grin.
The verb SMILE has 2 senses: 1. change one's facial expression by spreading the lips, often to signal pleasure. 2. express with a smile. Familiarity information: SMILE used as a verb is rare.