Third-person singular present tense of 'grin,' meaning to smile broadly, showing the teeth.
From Old English 'grennian,' related to Proto-Germanic *grin- (to grimace or bare teeth), which originally had slightly more aggressive connotations before softening into the friendly smile we know today.
The word 'grin' started out meaning something closer to a grimace or snarl, but over centuries it transformed into one of the most positive facial expressions we have—language actually tracks how human emotions evolved!
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