"You canker blossom!" 3 Shakespearean Insults
"grinding the teeth unconsciously," from Greek ebryxa, aorist root of brykein "to gnash the teeth."
bruxism brux·ism (brŭk'sĭz'əm)
The habitual involuntary grinding or clenching of the teeth, usually during sleep, as from anger, tension, fear, or frustration.