water couch

English

Noun

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.