(Science: botany) 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, quick grass, quick grass, twitch grass.
Origin: Properly quick grass, being probably so called from its vigorous growth, or from its tenacity of life. See Quick, and cf. Couch grass.