definition of
grit

[1] #1 grit n. [gritrock, gritstone] a hard coarse-grained siliceous sandstone. wn

[2] #2 grit v. cover with a grit; "grit roads". wn

[3] #3 grit n. [backbone, guts, moxie, sand, gumption] fortitude and determination; "he didn't have the guts to try it". wn

[4] #4 grit v. clench together; "grit one's teeth". wn