[kouch, kooch] 
| any of various grasses, esp. Agropyron repens, known chiefly as troublesome weeds and characterized by creeping rootstocks that spread rapidly. |
| couch grass n. 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.] |
