"that's saying something" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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        {
          "ref": "1997 June 26, J. K. Rowling [pseudonym; Joanne Rowling], Harry Potter and the Philosopher’s Stone (Harry Potter; 1), London: Bloomsbury Publishing, →ISBN:",
          "text": "Longbottom, if brains were gold you’d be poorer than Weasley, and that’s saying something.",
          "type": "quote"
        },
        {
          "text": "2015, ending theme song of Star vs. the Forces of Evil\nI think Earth is a pretty great place. That's saying something, 'cause I've been through outer space."
        }
      ],
      "glosses": [
        "Said of something that has an even greater impact or effect than what is readily apparent, considering the context."
      ],
      "id": "en-that's_saying_something-en-phrase-20dPVQBI",
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        [
          "impact",
          "impact#English"
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        [
          "effect",
          "effect#English"
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          "apparent",
          "apparent#English"
        ],
        [
          "context",
          "context#English"
        ]
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      "raw_glosses": [
        "(idiomatic) Said of something that has an even greater impact or effect than what is readily apparent, considering the context."
      ],
      "tags": [
        "idiomatic"
      ]
    }
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      "audio": "En-au-that's saying something.ogg",
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  "word": "that's saying something"
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  "lang_code": "en",
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      "examples": [
        {
          "ref": "1997 June 26, J. K. Rowling [pseudonym; Joanne Rowling], Harry Potter and the Philosopher’s Stone (Harry Potter; 1), London: Bloomsbury Publishing, →ISBN:",
          "text": "Longbottom, if brains were gold you’d be poorer than Weasley, and that’s saying something.",
          "type": "quote"
        },
        {
          "text": "2015, ending theme song of Star vs. the Forces of Evil\nI think Earth is a pretty great place. That's saying something, 'cause I've been through outer space."
        }
      ],
      "glosses": [
        "Said of something that has an even greater impact or effect than what is readily apparent, considering the context."
      ],
      "links": [
        [
          "impact",
          "impact#English"
        ],
        [
          "effect",
          "effect#English"
        ],
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          "apparent",
          "apparent#English"
        ],
        [
          "context",
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        ]
      ],
      "raw_glosses": [
        "(idiomatic) Said of something that has an even greater impact or effect than what is readily apparent, considering the context."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
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  "word": "that's saying something"
}