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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 definition of a simper is a coy or silly smile. The smile you give when you are self-conscious about something you have done is an example of a simper. Simper is to smile or smirk in a silly or coy way. When you are pleased with yourself and you give a silly smirk, this is an example of when you simper.