verb
to smile broadly, especially in an unrestrained or silly manner
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She walked into the room, grinning from ear to ear as she greeted her colleagues.
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I caught my friend grinning mischievously as she played a prank on our other friend.
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The comedian had the audience grinning like Cheshire cats with his hilarious jokes.
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The old man sat on the park bench, grinning at the memories of his youth.