磨牙

Traditional form:

磨牙

Pinyin (reading):

móyá

Definitions:

• to grind one's teeth (during sleep)
• pointless arguing
• (coll.) molar

Characters:

• 磨 - millstone; to grind, to polish, to rub, to wear out
• 牙 - tooth, molar; fang, tusk; serrated

Traditional characters:

• 磨 - millstone; to grind, to polish, to rub, to wear out
• 牙 - tooth, molar; fang, tusk; serrated