"in league" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "in league",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in league",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "1874, Marcus Clarke, For the Term of His Natural Life Chapter VII\nSarah Purfoy was in league with the convicts--was herself the wife or mistress of one of them. She had come on board armed with a plot for his release, and this plot was about to be put in execution."
        },
        {
          "ref": "1981, “In League with Satan”, in Welcome to Hell, performed by Venom",
          "text": "I'm in league with Satan / I was raised in hell / I walk the streets of Salem / Amongst the living dead",
          "type": "quotation"
        }
      ],
      "glosses": [
        "collaborating (with)"
      ],
      "id": "en-in_league-en-prep_phrase-WUrt2Wuc",
      "links": [
        [
          "collaborating",
          "collaborating"
        ]
      ]
    }
  ],
  "word": "in league"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "in league",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in league",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with quotations"
      ],
      "examples": [
        {
          "text": "1874, Marcus Clarke, For the Term of His Natural Life Chapter VII\nSarah Purfoy was in league with the convicts--was herself the wife or mistress of one of them. She had come on board armed with a plot for his release, and this plot was about to be put in execution."
        },
        {
          "ref": "1981, “In League with Satan”, in Welcome to Hell, performed by Venom",
          "text": "I'm in league with Satan / I was raised in hell / I walk the streets of Salem / Amongst the living dead",
          "type": "quotation"
        }
      ],
      "glosses": [
        "collaborating (with)"
      ],
      "links": [
        [
          "collaborating",
          "collaborating"
        ]
      ]
    }
  ],
  "word": "in league"
}