at a loss for words
無言以對；語塞；不知道說什么好
口語·表示震驚或困惑
英文釋義
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.
典故來源
源于失去語言能力的比喻，強調因強烈情緒而無法組織語言。