The Collaborative International Dictionary
Quitch grass \Quitch" grass`\ (kw[i^]ch" gr[.a]s`). [Properly quick grass, being probably so called from its vigorous growth, or from its tenacity of life. See Quick, and cf. Couch grass.] (Bot.) A perennial grass ( Agropyrum repens) having long running rootstalks, by which it spreads rapidly and pertinaciously, and so becomes a troublesome weed. Also called couch grass, quack grass, quick grass, twitch grass. See Illustration in Appendix.
Wiktionary
n. A species of grass, ''Elymus repens'', usually considered a weed.
WordNet
n. European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed [syn: dog grass, quackgrass, quack grass, quick grass, witch grass, witchgrass, Agropyron repens]
Usage examples of "couch grass".
He went tumbling from the path into the long couch grass at the lip of the cliff.
The nuns gathered morels and blewits, and Hathumod found an old stand of couch grass in a nearby clearing and dug up the now-bitter roots.
The old Roman settlements were deserted and their fields were tangled with couch grass.
Then he transferred his attention to the woman, plucked some hair from her head as casually as though he was weeding couch grass from a herbaceous border, pushed the head back.
But mostly it was overcome with couch grass and tendrils of bindweed.