\Quitch" grass`\ [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},
{quick grass}, {quick grass}, {twitch grass}. See
Illustration in Appendix.