Definition of Indian grass in US English:

Indian grass

noun

  • 1Angling. Silkworm gut used for making lines. Now historical and rare.

  • 2Chiefly US. Any of various grasses; especially Sorghastrum nutans, which is one of the dominant grasses of the North American prairies.

Origin

Late 17th century; earliest use found in The London Gazette. From Indian + grass.