be condemned out of one's own mouth;be condemned on one's own showing;be unable to advance any further arguments to justify oneself;fall silent on finding oneself bested in argument ;

As he had a weak case and could not defend himself , he had to resort to sophistry.
他理屈词穷,只好求助于诡辩.
来源:《现代汉英综合大词典》简答网 · 雅思托福
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