Grin vs. Smirk: What's the Difference?

Grin and Smirk Definitions
Grin
To smile broadly, often baring the teeth, as in amusement, glee, embarrassment, or other strong emotion.
Smirk
To smile in an annoying self-satisfied manner.
Grin
To express with a grin
I grinned my approval.
Smirk
An annoying self-satisfied smile.
Grin
The act of grinning.
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Smirk
An uneven, often crooked smile that is insolent, self-satisfied, conceited or scornful.
Grin
The facial expression produced by grinning.
Smirk
A forced or affected smile.
Grin
A smile in which the lips are parted to reveal the teeth.
Smirk
To smile in a way that is affected, smug, insolent or contemptuous.
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Grin
(obsolete) A snare; a gin.
Smirk
(obsolete) smart; spruce; affected; simpering
Grin
(intransitive) To smile, parting the lips so as to show the teeth.
Why do you grin?
Did I say something funny?
Smirk
To smile in an affected or conceited manner; to smile with affected complaisance; to simper.
Grin
(transitive) To express by grinning.
She grinned pleasure at his embarrassment.
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Smirk
A forced or affected smile; a simper.
The bride, all smirk and blush, had just entered.
Grin
To show the teeth, like a snarling dog.
Smirk
Nice,; smart; spruce; affected; simpering.
Grin
(transitive) To grin as part of producing a particular facial expression, such as a smile or sneer.
He grinned a broad smile when I told him the result.
He grinned a cruel sneer when I begged him to stop.
Smirk
A smile expressing smugness or scorn instead of pleasure
Grin
A snare; a gin.
Like a bird that hasteth to his grin.
Smirk
Smile affectedly or derisively
Grin
The act of closing the teeth and showing them, or of withdrawing the lips and showing the teeth; a hard, forced, or sneering smile.
He showed twenty teeth at a grin.
Grin
To show the teeth, as a dog; to snarl.
Grin
To set the teeth together and open the lips, or to open the mouth and withdraw the lips from the teeth, so as to show them, as in laughter, scorn, or pain.
The pangs of death do make him grin.
Grin
To express by grinning.
Grinned horrible a ghastly smile.
Grin
A facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement
Grin
To draw back the lips and reveal the teeth, in a smile, grimace, or snarl