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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.
2 n-count A smile is the expression that you have on your face when you smile. She gave a wry smile..., `There are some sandwiches if you're hungry,' she said with a smile... 3 verb If you say that something such as fortune smileson someone, you mean that they are lucky or successful.