couch grass

A Eurasian grass (Agropyron repens) that has whitish-yellow root stocks and has become a troublesome weed in the New World. Also called quack grass, witch grass.

[Alteration of QUITCH GRASS.]

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cynodon dactylon.

• couch grass + Balansiaspp. — grazing fungus-infested grass causes staggers syndrome.

The noun has one meaning:

Meaning #1: European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed
  Synonyms: dog grass, quackgrass, quack grass, quick grass, witch grass, witchgrass, Agropyron repens