To fully expose one's disgraceful conduct or ugly side; to reveal one's true colors in an unseemly way.
在激烈的讨论中，他因为未能说服对方，竟然穷形尽相地指责对方，场面一度失控。
During the heated discussion, as he failed to convince the other party, he disgracefully resorted to accusing them, and the situation briefly got out of control.
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