GRIN (2)

grin (2). Grin, v.i. to set the teeth together, laugh, titter

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Grin, v. i. [imp. & p. p. Grinned (grĭnd); p. pr. & vb. n. Grinning.] [[OE. grinnen, grennen, AS. grennian, Sw. grina; akin to D. grijnen, G. greinen, OHG. grinan, Dan. grine. √35. Cf. Groan.]] 1. 1. To show the teeth, as a dog; to snarl.
2. 2. 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. Shak.