To clench one's teeth together tightly because of pain, anger, frustration, or self-assurance. / (idiomatic) To face up to a difficult or disagreeable situation and deal with it.

present participle of grit one's teeth

simple past tense and past participle of grit one's teeth

A form of sedimentary rock, similar to sandstone but coarser.

plural of gritstone

Characterised or marked by grit (all senses); gritty

A surname.