to offer humble submission and plead for forgiveness; to surrender completely and show deep remorse (lit. with hands bound and a jade disc in the mouth, an ancient gesture of capitulation)
在事情败露后，他只好面缚衔璧，向大家承认了自己的过错。
After the truth came out, he had no choice but to offer humble submission and confess his wrongdoing to everyone.
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