"back story" meaning in English

{
  "forms": [
    {
      "form": "back stories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back story (plural back stories)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "backstory"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2013 March 1, Kaz [i.e., Kazimieras Gediminas Prapuolenis], Kim Roberson, Aliki Theofilopoulos Grafft, John Mathot, “Sidetracked”, in Phineas and Ferb, season 4, episode 7, spoken by Dr. Heinz Doofenshmirtz (Dan Povenmire)",
          "text": "Agent Lyla: Enough back story! / Dr. Doofenshmirtz: Actually, that's not, uh … that's not really a back story, it's just expositional flashback. It doesn't, uh, have any childhood trauma, it's doesn't really inform who he is, it's not … it's just flashback. There's a difference. It's subtle, but there's a difference.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of backstory"
      ],
      "id": "en-back_story-en-noun-aGyZGpo7",
      "links": [
        [
          "backstory",
          "backstory#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "back story"
}

{
  "forms": [
    {
      "form": "back stories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back story (plural back stories)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "backstory"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2013 March 1, Kaz [i.e., Kazimieras Gediminas Prapuolenis], Kim Roberson, Aliki Theofilopoulos Grafft, John Mathot, “Sidetracked”, in Phineas and Ferb, season 4, episode 7, spoken by Dr. Heinz Doofenshmirtz (Dan Povenmire)",
          "text": "Agent Lyla: Enough back story! / Dr. Doofenshmirtz: Actually, that's not, uh … that's not really a back story, it's just expositional flashback. It doesn't, uh, have any childhood trauma, it's doesn't really inform who he is, it's not … it's just flashback. There's a difference. It's subtle, but there's a difference.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of backstory"
      ],
      "links": [
        [
          "backstory",
          "backstory#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "back story"
}