"like the bottom of a birdcage" meaning in English

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      "expansion": "like the bottom of a birdcage",
      "name": "head"
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    {
      "args": {},
      "expansion": "like the bottom of a birdcage",
      "name": "en-PP"
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  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
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          "kind": "other",
          "name": "English entries with incorrect language header",
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      "examples": [
        {
          "ref": "1999, Ray Smith, The Man who Loved Jane Austen, page 158:",
          "text": "At ten to one, Sid slouched in with an overflowing briefcase in one hand and a basketball under his arm, complaining of a hangover. 'Mouth like the bottom of a birdcage.'",
          "type": "quote"
        },
        {
          "ref": "2009, Elisabeth Blandford, How to Write the Best Research Paper Ever!, page 49:",
          "text": "Does the bottom of your mouth taste like the bottom of a birdcage? Did you make a fool of yourself last night? Or don't you remember?",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very foul-tasting; said of a person's mouth after heavy drinking etc."
      ],
      "id": "en-like_the_bottom_of_a_birdcage-en-prep_phrase-hP-5kwff",
      "links": [
        [
          "foul",
          "foul"
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      "qualifier": "simile",
      "raw_glosses": [
        "(simile) Very foul-tasting; said of a person's mouth after heavy drinking etc."
      ]
    }
  ],
  "word": "like the bottom of a birdcage"
}

{
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      "expansion": "like the bottom of a birdcage",
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      "expansion": "like the bottom of a birdcage",
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        {
          "ref": "1999, Ray Smith, The Man who Loved Jane Austen, page 158:",
          "text": "At ten to one, Sid slouched in with an overflowing briefcase in one hand and a basketball under his arm, complaining of a hangover. 'Mouth like the bottom of a birdcage.'",
          "type": "quote"
        },
        {
          "ref": "2009, Elisabeth Blandford, How to Write the Best Research Paper Ever!, page 49:",
          "text": "Does the bottom of your mouth taste like the bottom of a birdcage? Did you make a fool of yourself last night? Or don't you remember?",
          "type": "quote"
        }
      ],
      "glosses": [
        "Very foul-tasting; said of a person's mouth after heavy drinking etc."
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        "(simile) Very foul-tasting; said of a person's mouth after heavy drinking etc."
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  "word": "like the bottom of a birdcage"
}