Definition of crabgrass noun from the Oxford Advanced Learner's Dictionary

 

crabgrass

 noun
noun
BrE BrE//ˈkræbɡrɑːs//
 
; NAmE NAmE//ˈkræbɡræs//
 
[uncountable](especially North American English)
 
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a type of grass that grows where it is not wanted, spreads quickly and is hard to get rid of
See the Oxford Advanced American Dictionary entry: crabgrass