grin /ˈgrɪn/
 露齒笑,裂口笑(vi.)(vt.)露齒而笑


 Grin n.  A snare; a gin. [Obs.]
    Like a bird that hasteth to his grin.   --Remedy of Love.


 Grin, v. i. [imp. & p. p. Grinned p. pr. &  vb. n. Grinning.]
 1. To show the teeth, as a dog; to snarl.
 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.


 Grin, v. t. To express by grinning.
    Grinned horrible a ghastly smile.   --Milton.


 Grin, n. 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.   --Addison.

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 grin
      n : a facial expression characterized by turning up the corners
          of the mouth; usually shows pleasure or amusement [syn: smile,
           smiling, grinning]
      v : to draw back the lips and reveal the teeth, in a smile,
          grimace, or snarl
      [also: grinning, grinned]