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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 at [sb/sth] vtr phrasal insepphrasal verb, transitive, inseparable: Verb with adverb(s) or preposition(s), having special meaning, not divisible--for example,go with [=combine nicely]: Those red shoes don't go with my dress..