Grit meaning : A collection of hard small materials, such as dirt, ground stone, debris from sandblasting or other such grinding, or swarf from metalworking. Inedible particles in food. A measure of the relative coarseness of an abrasive material such as sandpaper, the smaller the number the coarser the abrasive. A hard, coarse-grained siliceous sandstone; gritstone. Also, a finer sharp-grained sandstone, e.g., grindstone grit. Strength of mind; great courage or fearlessness; fortitude. Apparently only in grit one's teeth: to clench, particularly in reaction to pain or anger. To cover with grit. To give forth a grating sound, like sand under the feet; to grate; to grind.