"lean and mean" meaning in English

{
  "forms": [
    {
      "form": "leaner and meaner",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "leanest and meanest",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "leaner and meaner",
        "sup": "leanest and meanest"
      },
      "expansion": "lean and mean (comparative leaner and meaner, superlative leanest and meanest)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English coordinated pairs",
          "parents": [
            "Coordinated pairs",
            "Terms by etymology"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "He's a lean and mean fighting machine.",
          "type": "example"
        }
      ],
      "glosses": [
        "efficient because of having nothing in excess of what is needed, and single-minded in one's objective"
      ],
      "id": "en-lean_and_mean-en-adj-K9iV6Bhv",
      "links": [
        [
          "efficient",
          "efficient"
        ],
        [
          "single-minded",
          "single-minded"
        ]
      ],
      "raw_glosses": [
        "(colloquial) efficient because of having nothing in excess of what is needed, and single-minded in one's objective"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "word": "lean and mean"
}

{
  "forms": [
    {
      "form": "leaner and meaner",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "leanest and meanest",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "leaner and meaner",
        "sup": "leanest and meanest"
      },
      "expansion": "lean and mean (comparative leaner and meaner, superlative leanest and meanest)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English colloquialisms",
        "English coordinated pairs",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English rhyming phrases",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "He's a lean and mean fighting machine.",
          "type": "example"
        }
      ],
      "glosses": [
        "efficient because of having nothing in excess of what is needed, and single-minded in one's objective"
      ],
      "links": [
        [
          "efficient",
          "efficient"
        ],
        [
          "single-minded",
          "single-minded"
        ]
      ],
      "raw_glosses": [
        "(colloquial) efficient because of having nothing in excess of what is needed, and single-minded in one's objective"
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "word": "lean and mean"
}