"underbed" meaning in English

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        "2": "under",
        "3": "bed"
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      "expansion": "under- + bed",
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  "etymology_text": "From under- + bed.",
  "forms": [
    {
      "form": "underbeds",
      "tags": [
        "plural"
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  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1886, Geological Survey of Alabama, Special Report (issue 1, page 182)",
          "text": "It has an underbed of slate and a cover of hard shales which contains seams of sandstone and form a bluff."
        },
        {
          "ref": "2011, H. Leslie Simmons, Olin's Construction: Principles, Materials, and Methods, page 771:",
          "text": "An underbed is necessary in unbonded cementitious installations and may be required in some bonded ones.",
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        }
      ],
      "glosses": [
        "An underlying base that supports a bed or foundation."
      ],
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          "bed",
          "bed"
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          "foundation",
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  "word": "underbed"
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        "2": "under",
        "3": "bed"
      },
      "expansion": "under- + bed",
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    }
  ],
  "etymology_text": "From under- + bed.",
  "forms": [
    {
      "form": "underbeds",
      "tags": [
        "plural"
      ]
    }
  ],
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  "pos": "noun",
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        {
          "ref": "1886, Geological Survey of Alabama, Special Report (issue 1, page 182)",
          "text": "It has an underbed of slate and a cover of hard shales which contains seams of sandstone and form a bluff."
        },
        {
          "ref": "2011, H. Leslie Simmons, Olin's Construction: Principles, Materials, and Methods, page 771:",
          "text": "An underbed is necessary in unbonded cementitious installations and may be required in some bonded ones.",
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        }
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      "glosses": [
        "An underlying base that supports a bed or foundation."
      ],
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        [
          "bed",
          "bed"
        ],
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          "foundation",
          "foundation"
        ]
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