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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.
Three Methods: Practicing Your Smile Getting in the Right Mindset Trying Other Smiles. Smiling with your eyes, which is called the Duchenne smile or smizing, is the most sincere type of smile. When you engage your eyes instead of just your mouth, your smile has the power to charm other people.The tricky thing about smiling with your eyes is that it's very difficult to fake a smize; when you smile with your eyes, you're really feeling happy.ips. 1  When you smile let it be your true and comfortable smile. 2  Duchenne smiles and wrinkles go hand-in-hand. 3  In the event you actually have difficulty smiling due to tension in the face or a tension headache, you can do a relaxation exercise.