Grit

1. Sand or gravel; rough, hard particles.
2. Grain, esp. oats or wheat, hulled and coarsely ground; in high milling, fragments of cracked wheat smaller than groats.
3. Structure, as adapted to grind or sharpen; as, a hone of good grit.
4. To grind; to rub harshly together; to grate; as, to grit the teeth.
5. The coarse part of meal.
6. 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.
7. To give forth a grating sound, as sand under the feet; to grate; to grind.
8. Firmness of mind; invincible spirit; unyielding courage; fortitude.