Definition of cutting grass
1 Australia : any of several sedges of the genera Gahnia and Cladium; especially : a widely distributed sedge (C. psittacorum) with sharp-edged triquetrous leaves —called also cutty grass
2 : a sedge of the genus Scleria; especially : a high-climbing tropical American sedge (S. flagellum-nigrorum) with cutting stems
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