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bird grass

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noun
  1. a grass, Poa trivialis, grown in temperate regions of North America largely for lawns and turf.
  2. the knotgrass, Polygonum aviculare.
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Origin of bird grass

An Americanism dating back to 1775–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018