be tongue-tied
他们在民众面前，不能抓到他的语病，且惊奇他的应对，遂噤口不言。
And they could not reprehend his word before the people: and wondering at his answer, they held their peace.
youdao
形容闭口不作声。闭着嘴不说话。出自吕岩的《寄白龙洞刘道人》。
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