Hi, Here's the basic physical diference. I can smile with my lips together or apart. If I grin, you definitely see my teeth.
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anglista2008What's the difference between a smile and a grin or to smile and to grin ?smile strikes me as natural and friendly. grin is more exaggerated and can take on any of several different aspects, some of which are definitely not friendly: an evil grin, a grin of embarrassment, a sheepish grin, a dopey