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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.
Chelsea Grin. A Chelsea Grin (also known as a Chelsea Smile or a Glasgow Grin) is an act popular among British gangs which involves making a cut from the side of someones mouth all the way up to their ear. Due to the cut, it appears as if the victim is smiling.