at a loss for words
无言以对；语塞；不知道说什么好
口语·表示震惊或困惑
英文释义
unable to speak or express oneself, typically due to shock, surprise, or confusion
例句
When she heard the shocking news, she was completely at a loss for words.
典故来源
源于失去语言能力的比喻，强调因强烈情绪而无法组织语言。