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crab grass

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noun
  1. an annual grass, Digitaria sanguinalis, common in cultivated and waste grounds and often occurring as a pest weed in lawns.
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Origin of crab grass

First recorded in 1590–1600
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for crabgrass

crab grass

noun
  1. any of several coarse weedy grasses of the genus Digitaria, which grow in warm regions and tend to displace other grasses in lawns
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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

Word Origin and History for crabgrass

n.

c.1600, from crab (n.1) + grass. Originally a marine grass of salt marshes; modern meaning is from 1743. Perhaps partly for its crooked form.

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Online Etymology Dictionary, © 2010 Douglas Harper