To bare one's teeth with an open mouth, often used to describe a fierce, menacing appearance or a grimace of unbearable pain.
他一不小心撞到桌角，疼得咨牙俫嘴，好一会儿才缓过来。
He accidentally bumped into the corner of the table, grimacing in pain with bared teeth, and it took him a while to recover.
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