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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.
grin like a Cheshire cat, to smile or grin inscrutably. A cat with an enormous grin encountered by Alice in Alice's Adventures in Wonderland, by Lewis Carroll. The cat tends to disappear, leaving only its smile hanging in the air. Note: âSmiling like a Cheshire catâ refers to anyone with a conspicuous and long-lasting smile.