Grit

Part of speech: noun (n.)

1. Sand or gravel; rough, hard particles.

2. The coarse part of meal.

3. Grain, esp. oats or wheat, hulled and coarsely ground; in high milling, fragments of cracked wheat smaller than groats.

4. 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.

Part of speech: verb (v.)

To give forth a grating sound, as sand under the feet; to grate; to grind. The sanded floor that grits beneath the tread. Goldsmith.

Part of speech: verb (v.)

To grind; to rub harshly together; to grate; as, to grit the teeth. [Collog.]