grit

Short definition from Wiktionary

Noun

1. 1
   A collection of hard small materials, such as dirt, ground stone, debris from sandblasting or other such grinding, or swarf from metalworking.
2. 2
   A collection of hard small materials, such as dirt, ground stone, debris from sandblasting or other such grinding, or swarf from metalworking: Sand or a sand–salt mixture spread on wet and, especially, icy roads and footpaths to improve traction.
3. 3
   Small, hard, inedible particles in food.
4. 4
   A measure of the size of abrasive grains, such as those on sandpaper, and thus their relative coarseness or fineness; the smaller the number, the coarser the abrasive: thus, 60 is rough, 600 is fine, and 3000 is ultrafine.
5. 5
   A hard, coarse-grained siliceous sandstone; gritstone. Also, a finer sharp-grained sandstone, e.g., grindstone grit.
6. 6
   Strength of mind; courage or fearlessness; fortitude.
7. 7
   Husked but unground oats.
8. 8
   Coarsely ground corn or hominy used as porridge.
9. 9
   A member or supporter of the Liberal Party of Canada or one of its provincial wings (except for the Quebec provincial wing).

Verb

1. 1
   Apparently only in grit one's teeth: to clench, particularly in reaction to pain or anger.
2. 2
   To cover with grit.
3. 3
   To give forth a grating sound, like sand under the feet; to grate; to grind.

Adjective

1. 1
   Of or belonging to the Liberal Party of Canada.