gritting

/G R IH1 T IH0 NG/
verb
  1. 1

    Apparently only in grit one's teeth: to clench, particularly in reaction to pain or anger.

    โ€œHe has a sleeping disorder and grits his teeth.โ€

  2. 2

    To cover with grit.

  3. 3

    To give forth a grating sound, like sand under the feet; to grate; to grind.

noun
  1. 1

    The act by which something is gritted.

Source: https://en.wiktionary.org/wiki/grit, https://en.wiktionary.org/wiki/gritting