Definition of quack grass in English:

quack grass

noun

  • North American term for couch
    • ‘Fast-growing fall cover crops outcompete late-season weeds like quack grass and chickweed.’
    • ‘In his pasture, edible weeds like dandelion, chicory, quack grass and even stinging nettles are allowed to thrive.’
    • ‘A recent example is a cross with bread wheat and quack grass.’
    • ‘My worst weeds are the perennials that spread with runners, like quack grass.’
    • ‘However, many people have different kinds of thick bladed grass in their lawn such as quack grass.’

Origin

Early 19th century: quack, variant of quick, northern form of quitch.