- an annual grass, Digitaria sanguinalis, common in cultivated and waste grounds and often occurring as a pest weed in lawns.
Origin of crab grass
First recorded in 1590–1600
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for crab grass
It was autumn, and streaks of gray could be seen in the crab-grass.Up Terrapin River
Opie P. Read
In the economy of farmers entirely up against the crab-grass in the cotton-patch, the mule is mightier than the sword.Oklahoma Sunshine
Freeman E. (Freeman Edwin) Miller
In my opinion, crab-grass would answer well for pasture-grass in moist situations.
- any of several coarse weedy grasses of the genus Digitaria, which grow in warm regions and tend to displace other grasses in lawns
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012