"upward mobility" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "2012 October 24, David Leonhardt, quoting Frank Levy, “Standard of Living Is in the Shadows as Election Issue”, in The New York Times, →ISSN:",
          "text": "“The whole notion of the American dream,” said Frank Levy, an M.I.T. economist, “described a mass upward mobility that is just a lot harder to achieve right now.”",
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      "glosses": [
        "Ability to advance to better-paid or better-regarded social strata."
      ],
      "id": "en-upward_mobility-en-noun-teQCGlfC",
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        [
          "sociology",
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          "advance",
          "advance"
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        "(sociology) Ability to advance to better-paid or better-regarded social strata."
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      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "ability to advance in society",
          "word": "sosiaalinen nousu"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "ability to advance in society",
          "tags": [
            "feminine"
          ],
          "word": "Aufwärtsmobilität"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "ability to advance in society",
          "tags": [
            "feminine"
          ],
          "word": "Aufstiegsfähigkeit"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "ability to advance in society",
          "word": "mobilità verticale"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "ability to advance in society",
          "tags": [
            "masculine"
          ],
          "word": "awans społeczny"
        }
      ]
    }
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  "word": "upward mobility"
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          "ref": "2012 October 24, David Leonhardt, quoting Frank Levy, “Standard of Living Is in the Shadows as Election Issue”, in The New York Times, →ISSN:",
          "text": "“The whole notion of the American dream,” said Frank Levy, an M.I.T. economist, “described a mass upward mobility that is just a lot harder to achieve right now.”",
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        }
      ],
      "glosses": [
        "Ability to advance to better-paid or better-regarded social strata."
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        "(sociology) Ability to advance to better-paid or better-regarded social strata."
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  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "ability to advance in society",
      "word": "sosiaalinen nousu"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "ability to advance in society",
      "tags": [
        "feminine"
      ],
      "word": "Aufwärtsmobilität"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "ability to advance in society",
      "tags": [
        "feminine"
      ],
      "word": "Aufstiegsfähigkeit"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "ability to advance in society",
      "word": "mobilità verticale"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "ability to advance in society",
      "tags": [
        "masculine"
      ],
      "word": "awans społeczny"
    }
  ],
  "word": "upward mobility"
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