言こと葉ばに詰つまる

expression, godan verb (-ru)

be at a loss for words; be stuck for words

Used when someone cannot find the right words to say, often due to emotion, surprise, or difficulty expressing oneself.

• 突とつ然ぜんの質しつ問もんに、彼かれは言こと葉ばに詰つまった。

  He was at a loss for words at the sudden question.

• 感かん謝しゃの気き持もちを伝つたえようとしたが、言こと葉ばに詰つまってしまった。

  I tried to express my gratitude, but I got stuck for words.