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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 exact cognates in other languages, but probably related to smerian to laugh at, scorn, from Proto-Germanic *smer-, *smar-, variant of PIE *smei-to smile; see smile (v.), which after c.1500 gradually restricted smirk to the unpleasant sense smile affectedly; grin in a malicious or smug way.