Grin definitions

grĭn
The act of grinning.
noun
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The facial expression produced by grinning.
noun
38
2
The act or look of one who grins.
noun
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To smile broadly, often baring the teeth, as in amusement, glee, embarrassment, or other strong emotion.
verb
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To smile broadly as in amusement or pleasure, or, sometimes, in embarrassment.
verb
34
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To express with a grin.

I grinned my approval.

verb
32
1
To draw back the lips and show the teeth in pain, scorn, etc.
verb
31
1
To express by grinning.
verb
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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.

noun
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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.

verb
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A smile in which the lips are parted to reveal the teeth.
noun
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(obsolete) A snare; a gin.
noun
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(intransitive) To smile, parting the lips so as to show the teeth.

Why do you grin? Did I say something funny?

verb
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To express by grinning.

She grinned pleasure at his embarrassment.

verb
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(intransitive, dated) To show the teeth, like a snarling dog.
verb
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0

Origin of grin

Before 1000 CE - From Middle English grinnen, from Old English grennian compare to Old High German grennan (“to mutter”)