be reduced to silence
年轻人明白这一点，缄口无言了。
The young man knew this and was silent.
youdao
只有实实在在的一顿饭才能使他暂时缄口无言。
It was only a substantial meal that could induce in him even a passing taciturnity.
缄口无言，汉语成语，拼音是jiān kǒu wú yán，意思是闭着嘴，不说话。出自《景德传灯录》。
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