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\ ˈkwak- 
\
\Definition of quack grass
: 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
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Time Traveler for quack grass
The first known use of quack grass was circa 1818
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