"well acquainted" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "well acquainted",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Very familiar with someone or something."
      ],
      "id": "en-well_acquainted-en-adj-1ZendX4f",
      "links": [
        [
          "familiar",
          "familiar"
        ]
      ]
    }
  ],
  "word": "well acquainted"
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "well acquainted",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Very familiar with someone or something."
      ],
      "links": [
        [
          "familiar",
          "familiar"
        ]
      ]
    }
  ],
  "word": "well acquainted"
}