a European perennial grass (Agropyron repens) that spreads rapidly by its underground stems and is a troublesome weed in North America; quack grass
Origin:
var. of quitch
See couch grass in American Heritage Dictionary 4
noun
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.