"water couch" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "1901 May 10, “Paspalum Dilatatum”, in The Agricultural Journal and Mining Record, volume 4, number 5, page 153:",
          "text": "Where at one time might be seen waving fields of rye-grass, cocksfoot, and clovers, are now growing the unsightly and undesirable tussocks, and the low-lying fields are covered in many cases with what is commonly called water-couch or swamp grass.",
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      "glosses": [
        "Paspalum distichum, a weedy perennial grass of wet areas."
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          "word": "knotgrass"
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  "word": "water couch"
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          "text": "Where at one time might be seen waving fields of rye-grass, cocksfoot, and clovers, are now growing the unsightly and undesirable tussocks, and the low-lying fields are covered in many cases with what is commonly called water-couch or swamp grass.",
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  "word": "water couch"
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