'''GNASH''' ''You see'': You gnash your teeth. ''Others see'': <Person> gnashes <his/her> teeth. '''GNASH <self>''' ''You see'': You grind your teeth. ''Others see'': <Person> grinds <his/her> teeth. '''GNASH <person>''' ''You see'': You gnash your teeth at <Person>. ''Target sees'': <Person> gnashes <his/her> teeth at you. ''Others see'': <Person1> gnashes <his/her> teeth at <Person2>.