a European grass (Elytrigia repens synonym Agropyron repens) that is naturalized throughout North America and spreads by creeping rhizomes —called also couch grass, quitch, twitch, witchgrass
quack grass
noun(quack grass)
a noise made by quacking
quack grass
noun(quack grass)
charlatan
quack grass
noun(quack grass)
an ignorant, misinformed, or dishonest practitioner of medicine