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During the Tang Dynasty, General Zhang Xun defended Suiyang and was respectfully known as "Zhang Suiyang."
He was valiant in battle and skilled at leadership.
During his campaign against the An Lushan Rebellion, he often shouted loudly to boost morale.
At one mobilization meeting, he was so impassioned that he gnashed his teeth until his gums were pierced.

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Open the tool →嚼齿穿龈 (jiáo chǐ chuān yín) is a Chinese idiom (chengyu) meaning “to gnash one's teeth so hard as to pierce the gums”.
嚼齿穿龈 is pronounced jiáo chǐ chuān yín in Mandarin Chinese.
Literally, 嚼齿穿龈 means “Gnash teeth pierce gums”. It is used to mean “to gnash one's teeth so hard as to pierce the gums”.
嚼齿穿龈 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
齿:牙齿。穿:咬破。龈:牙龈。紧咬牙齿,竟咬破了牙龈。形容对敌人恨之入骨。