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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 wry is a mocking, biting or sarcastic sort of humor, or an unpleasant facial expression used to indicate displeasure. 1  An example of wry humor is a sarcastic joke.  An example of a wry expression is when you wrinkle up your face when you taste something you dislike.