n. A member of the genus Digitaria, a grass of tropical to temperate climates, and a major pest of lawns in such climates, mainly from their invasive habits and the fact they die off in the fall and winter, leaving ugly bare patches.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. grasses with creeping stems that root freely; a pest in lawns
Word Usage
"Beside the Dumpster in the crabgrass was a pallet stacked with new asphalt shingles."