Mat's hand tightened on his purse until the coins inside grated together.

The words grated like two chunks of sandstone rubbing together.

His voice had all the warmth of two rocks being grated together.

His teeth grated together as he tried to control the anger building up inside him.

I felt my teeth grating together and forced a smile.

I felt my teeth grating together and forced myself to stop.

Teeth grating together, he stood up on his feet.

I could hear my teeth grate together and forced myself to keep control.

Rose's head swiveled slowly back and forth, her teeth grating together.

He felt them grate together under his fingers and almost passed out from the fiery pain.