"at a loss for words" meaning in 英語

{
  "categories": [
    {
      "kind": "other",
      "name": "英語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語 成句",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語_成句_副詞句",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語_成句_形容詞句",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "phrase",
  "pos_title": "成句",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "英語 慣用的表現",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "This is shocking news. I'm at a loss for words.",
          "translation": "衝撃的な知らせで言葉が見当たりません。"
        },
        {
          "text": "His record is awesome. I'm at a loss for words.",
          "translation": "彼の記録はすごすぎて言葉が見当たりません。"
        },
        {
          "text": "He was late for his class again, I'm at a loss for words.",
          "translation": "彼は授業にまた遅刻をしました。言葉が見当たりません。"
        }
      ],
      "glosses": [
        "(良い意味でも悪い意味でも) 言葉を失いながら、言葉が見当たらない、衝撃的な、絶句しながら。"
      ],
      "id": "ja-at_a_loss_for_words-en-phrase-4MrRxhOz",
      "ruby": [
        [
          "失",
          "うしな"
        ],
        [
          "見当",
          "みあ"
        ]
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "at a loss for words"
}

{
  "categories": [
    "英語",
    "英語 成句",
    "英語_成句_副詞句",
    "英語_成句_形容詞句"
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "phrase",
  "pos_title": "成句",
  "senses": [
    {
      "categories": [
        "英語 慣用的表現"
      ],
      "examples": [
        {
          "text": "This is shocking news. I'm at a loss for words.",
          "translation": "衝撃的な知らせで言葉が見当たりません。"
        },
        {
          "text": "His record is awesome. I'm at a loss for words.",
          "translation": "彼の記録はすごすぎて言葉が見当たりません。"
        },
        {
          "text": "He was late for his class again, I'm at a loss for words.",
          "translation": "彼は授業にまた遅刻をしました。言葉が見当たりません。"
        }
      ],
      "glosses": [
        "(良い意味でも悪い意味でも) 言葉を失いながら、言葉が見当たらない、衝撃的な、絶句しながら。"
      ],
      "ruby": [
        [
          "失",
          "うしな"
        ],
        [
          "見当",
          "みあ"
        ]
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "at a loss for words"
}