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water couch

From Wiktionary, the free dictionary

English

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Noun

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water couch (uncountable)

  1. Paspalum distichum, a weedy perennial grass of wet areas.
    Synonym: knotgrass
    • 1901 May 10, “Paspalum Dilatatum”, in The Agricultural Journal and Mining Record[1], volume 4, number 5, page 153:
      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.