1. [n]  (informal) fortitude and determination; "he didn't have the guts to try it"
2. [n]  a hard coarse-grained siliceous sandstone
3. [v]  clench together; "grit one's teeth"
4. [v]  cover with a grit; "grit roads"

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1. \Grit\, n. [OE, greet, greot, sand, gravel, AS. gre['o]t
   grit, sant, dust; akin to OS griott, OFries. gret gravel,
   OHG. grioz, G. griess, Icel. grj[=o]t, and to E. groats,
   grout. See {Groats}, {Grout}, and cf. {Grail} gravel.]
   1. Sand or gravel; rough, hard particles.
   2. The coarse part of meal.
   3. pl. Grain, esp. oats or wheat, hulled and coarsely ground;
      in high milling, fragments of cracked wheat smaller than
      groats.
   4. (Geol.) A hard, coarse-grained siliceous sandstone; as,
      millstone grit; -- called also {gritrock} and {gritstone.}
      The name is also applied to a finer sharp-grained
      sandstone; as, grindstone grit.
   5. Structure, as adapted to grind or sharpen; as, a hone of
      good grit.
   6. Firmness of mind; invincible spirit; unyielding courage;
      fortitude. --C. Reade. E. P. Whipple.
   

2. \Grit\ (gr[i^]t), v. i.
   To give forth a grating sound, as sand under the feet; to
   grate; to grind.
         The sanded floor that grits beneath the tread.
                                                  --Goldsmith.
   

3. \Grit\, v. t. [imp. & p. p. {Gritted}; p. pr. &, vb. n.
   {Gritting}.]
   To grind; to rub harshly together; to grate; as, to grit the
   teeth. [Collog.]