bird grass
Americannoun
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a grass, Poa trivialis, grown in temperate regions of North America largely for lawns and turf.
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the knotgrass, Polygonum aviculare.
Etymology
Origin of bird grass
An Americanism dating back to 1775–85
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.