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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.
Related words. 1  grin verb. 2  grin and bear it phrase. 3  grin/smile from ear to ear phrase.  wipe the smile/grin off someoneâs face 1  phrase. a big smile that shows your teeth âA great win,â Mike said with a broad grin. Synonyms and related words.