"shouldn't've" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "shouldn't",
        "3": "'ve"
      },
      "expansion": "shouldn't + -'ve",
      "name": "suffix"
    }
  ],
  "etymology_text": "shouldn't + -'ve",
  "forms": [
    {
      "form": "shouldn’t’ve",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "contraction",
        "head": "shouldn’t’ve"
      },
      "expansion": "shouldn’t’ve",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "contraction",
  "senses": [
    {
      "alt_of": [
        {
          "word": "should not have"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -'ve",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1990 October, Jamie Delano, “The Bogeyman”, in Hellblazer, number 34, DC Comics, page 8",
          "text": "She’s right. I shouldn’t’ve come.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Contraction of should not have."
      ],
      "id": "en-shouldn't've-en-contraction-KeUfBQF9",
      "links": [
        [
          "should",
          "should#English"
        ],
        [
          "not",
          "not#English"
        ],
        [
          "have",
          "have#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Contraction of should not have."
      ],
      "related": [
        {
          "word": "couldn't've"
        },
        {
          "word": "wouldn't've"
        },
        {
          "word": "oughtn't've"
        }
      ],
      "synonyms": [
        {
          "tags": [
            "colloquial"
          ],
          "word": "shouldna"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈʃʊd(ə)n(t)ə(v)/",
      "tags": [
        "US"
      ]
    },
    {
      "audio": "en-US shouldn't've.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/13/En-US_shouldn%27t%27ve.ogg/En-US_shouldn%27t%27ve.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/13/En-US_shouldn%27t%27ve.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    }
  ],
  "word": "shouldn't've"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "shouldn't",
        "3": "'ve"
      },
      "expansion": "shouldn't + -'ve",
      "name": "suffix"
    }
  ],
  "etymology_text": "shouldn't + -'ve",
  "forms": [
    {
      "form": "shouldn’t’ve",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "contraction",
        "head": "shouldn’t’ve"
      },
      "expansion": "shouldn’t’ve",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "contraction",
  "related": [
    {
      "word": "couldn't've"
    },
    {
      "word": "wouldn't've"
    },
    {
      "word": "oughtn't've"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "word": "should not have"
        }
      ],
      "categories": [
        "English 3-syllable words",
        "English auxiliary verb forms",
        "English contractions",
        "English double contractions",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English informal terms",
        "English non-lemma forms",
        "English terms suffixed with -'ve",
        "English terms with IPA pronunciation",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1990 October, Jamie Delano, “The Bogeyman”, in Hellblazer, number 34, DC Comics, page 8",
          "text": "She’s right. I shouldn’t’ve come.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Contraction of should not have."
      ],
      "links": [
        [
          "should",
          "should#English"
        ],
        [
          "not",
          "not#English"
        ],
        [
          "have",
          "have#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Contraction of should not have."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "contraction",
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈʃʊd(ə)n(t)ə(v)/",
      "tags": [
        "US"
      ]
    },
    {
      "audio": "en-US shouldn't've.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/13/En-US_shouldn%27t%27ve.ogg/En-US_shouldn%27t%27ve.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/1/13/En-US_shouldn%27t%27ve.ogg",
      "tags": [
        "US"
      ],
      "text": "Audio (US)"
    }
  ],
  "synonyms": [
    {
      "tags": [
        "colloquial"
      ],
      "word": "shouldna"
    }
  ],
  "word": "shouldn't've"
}