"dog grass" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dog grass (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "parents": [
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          "parents": [
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          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Hordeeae tribe grasses",
          "orig": "en:Hordeeae tribe grasses",
          "parents": [
            "Grasses",
            "Commelinids",
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Elymus repens, a coarse perennial grass common in uncultivated grounds"
      ],
      "id": "en-dog_grass-en-noun-CI5acC8H",
      "links": [
        [
          "Elymus repens",
          "Elymus repens#Translingual"
        ]
      ],
      "synonyms": [
        {
          "word": "couch grass"
        },
        {
          "word": "common couch"
        },
        {
          "word": "twitch"
        },
        {
          "word": "quick grass"
        },
        {
          "word": "quitch grass"
        },
        {
          "word": "quitch"
        },
        {
          "word": "quackgrass"
        },
        {
          "word": "scutch grass"
        },
        {
          "word": "witchgrass"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "dog grass"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "dog grass (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with topic categories using raw markup",
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        "English multiword terms",
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        "English uncountable nouns",
        "en:Hordeeae tribe grasses"
      ],
      "glosses": [
        "Elymus repens, a coarse perennial grass common in uncultivated grounds"
      ],
      "links": [
        [
          "Elymus repens",
          "Elymus repens#Translingual"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "couch grass"
    },
    {
      "word": "common couch"
    },
    {
      "word": "twitch"
    },
    {
      "word": "quick grass"
    },
    {
      "word": "quitch grass"
    },
    {
      "word": "quitch"
    },
    {
      "word": "quackgrass"
    },
    {
      "word": "scutch grass"
    },
    {
      "word": "witchgrass"
    }
  ],
  "word": "dog grass"
}