To be tongue-tied and speechless, often due to guilt, embarrassment, fear, or having no valid argument left.
面对铁证如山的事实，他结舌钳口，一句话也说不出来。
Facing the irrefutable evidence, he was tongue-tied and couldn't utter a single word.
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To be tongue-tied and speechless, often due to guilt, embarrassment, fear, or having no valid argument left.