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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 noun SMILE has 1 sense: 1. a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement. Familiarity information: SMILE used as a noun is very rare.