| a couch grass, Agropyron repens, a pernicious weed in cultivated fields. |
| 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.] |
| quack grass n. See couch grass. [Variant of quitch grass.] |