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crab grass

crab grass

2.5
A grass with stems that spread along the ground and root, often a weed in lawns
  • noun
  • /kræb ɡræs/
translation icon : pasto cangrejo

Examples

  • Next year, the crab grass won't be allowed to germinate.

    Academic text (1997)
  • The little point of straggling crab grass and rock was littered with bits of rubbish, a discarded fishing net, and some rusty hooks.

    Fiction book (1994)
  • Homeowners often struggle to keep their lawns healthy due to the presence of crab grass, which tends to take over.

  • Next year, I plan to apply preventative measures so that crab grass doesn't sprout in my garden.

  • To maintain a beautiful yard, you must regularly remove crab grass before it can spread.

Synonyms

crabgrass
vscrab grass
5 3.4

A common lawn weed with stems that grow along the ground and root easily

is written as two separate words instead of one

Surface Forms

crab grass singular
crab grasses plural

Morphology

crab + grass

The compound clearly denotes a kind of grass, so a learner who knows 'grass' will infer it's a plant type; however the role of 'crab' is metaphorical (referring to a creeping, sideways habit) and the additional sense of a weedy, rooting grass is not directly predictable from the constituents. Because the specific morphological behavior and negative connotation as a lawn weed require lexical/cultural knowledge beyond the literal words, this is best classed as partially transparent.

Etymology

Crab grass may come from how the plant grows: long stems creep sideways like a crab, and each stem takes root to make more grass. That's why the name refers to a common 'weed' that quickly spreads across lawns.