gnash the teeth in anger; grind one's teeth
No doubt he is gnashing his teeth in rage.
His stepmother clenched her teeth with hatred and scolded HIM.
It was as if the Night sang dirges with clenched teeth.
ErNian let guys to pick up packages are stealth, grandma, and all the men hate her teeth.
One day, after a nasty fall, Winnie decided something had to be done.