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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.
[no object] Smile in an irritatingly smug, conceited, or silly way. âhe smirked in triumphâ. âThe intimidating look from Feror grew fiercer as he smirked with a devious smile.â. âIn fact, she is 58 and proud of it, smirking at suggestions she looks a decade younger.â.