"done thing" meaning in English

{
  "forms": [
    {
      "form": "done things",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "done thing (plural done things)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1985, Susan Howatch, Wheel of Fortune",
          "text": "I wanted to be called Linda but Aunt Angela said that was a common name, you know, not the done thing, so I have to be Bella...",
          "type": "quotation"
        },
        {
          "ref": "2000 August 12, Vivek Chaudhary, The Guardian",
          "text": "I was only 18 and was having back problems so I got regular cortisone injections. It was the done thing in those days, all the players were having them.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Something done habitually or according to social norms, expectations, etc."
      ],
      "id": "en-done_thing-en-noun--UFcOVSf",
      "links": [
        [
          "habitually",
          "habitually"
        ],
        [
          "norm",
          "norm"
        ]
      ],
      "raw_glosses": [
        "(chiefly UK) Something done habitually or according to social norms, expectations, etc."
      ],
      "related": [
        {
          "word": "do the decent thing"
        }
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "done thing"
}

{
  "forms": [
    {
      "form": "done things",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "done thing (plural done things)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "do the decent thing"
    }
  ],
  "senses": [
    {
      "categories": [
        "British English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1985, Susan Howatch, Wheel of Fortune",
          "text": "I wanted to be called Linda but Aunt Angela said that was a common name, you know, not the done thing, so I have to be Bella...",
          "type": "quotation"
        },
        {
          "ref": "2000 August 12, Vivek Chaudhary, The Guardian",
          "text": "I was only 18 and was having back problems so I got regular cortisone injections. It was the done thing in those days, all the players were having them.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Something done habitually or according to social norms, expectations, etc."
      ],
      "links": [
        [
          "habitually",
          "habitually"
        ],
        [
          "norm",
          "norm"
        ]
      ],
      "raw_glosses": [
        "(chiefly UK) Something done habitually or according to social norms, expectations, etc."
      ],
      "tags": [
        "UK"
      ]
    }
  ],
  "word": "done thing"
}