"'d better" meaning in English

{
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      "args": {
        "1": "en",
        "2": "verb"
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      "expansion": "'d better",
      "name": "head"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "had better"
        }
      ],
      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
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      "derived": [
        {
          "word": "you'd better believe it"
        }
      ],
      "examples": [
        {
          "text": "You'd better slow down. The police are behind us.",
          "type": "example"
        },
        {
          "ref": "1965, Bob Dylan (lyrics and music), “Like a Rolling Stone”:",
          "text": "But you'd better take your diamond ring, you'd better pawn it, babe.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Contraction of had better."
      ],
      "id": "en-'d_better-en-verb-GnXm4mCw",
      "links": [
        [
          "had better",
          "had better#English"
        ]
      ],
      "raw_glosses": [
        "(modal, auxiliary verb) Contraction of had better."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "auxiliary",
        "contraction",
        "modal"
      ]
    }
  ],
  "word": "'d better"
}

{
  "derived": [
    {
      "word": "you'd better believe it"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "verb"
      },
      "expansion": "'d better",
      "name": "head"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "had better"
        }
      ],
      "categories": [
        "English auxiliary verbs",
        "English contractions",
        "English defective verbs",
        "English entries with incorrect language header",
        "English irregular verbs",
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        "English modal verbs",
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        "English terms with usage examples",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "You'd better slow down. The police are behind us.",
          "type": "example"
        },
        {
          "ref": "1965, Bob Dylan (lyrics and music), “Like a Rolling Stone”:",
          "text": "But you'd better take your diamond ring, you'd better pawn it, babe.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Contraction of had better."
      ],
      "links": [
        [
          "had better",
          "had better#English"
        ]
      ],
      "raw_glosses": [
        "(modal, auxiliary verb) Contraction of had better."
      ],
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    }
  ],
  "word": "'d better"
}