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The Collaborative International Dictionary
doub grass

Doob grass \Doob" grass`\ [Hind. d?b.] (Bot.) A perennial, creeping grass ( Cynodon dactylon), highly prized, in Hindostan, as food for cattle, and acclimated in the United States. [Written also doub grass.]

Wiktionary
doub grass

n. (alternative form of doob grass English)