磨牙 grind one's teeth; indulge in idle talk; molar\n【医】 axle-tooth; azzle-tooth; azzlz teeth; back teeth; brymus\n dentes columellaris; dentes molares; grinder; jaw teeth\n masticatory teeth; molar; molar teeth; mylodontes; mylodus\n odontoprisis; triturating teeth; wall teeth