The Collaborative International Dictionary
grass sack
Gunny \Gun"ny\ (g[u^]n"n[y^]), n., Gunny cloth \Gun"ny cloth`\(kl[o^]th`; 115). [Hind. go[.n], go[.n][imac], a sack, sacking.] A strong, coarse kind of sacking, made from the fibers (called jute) of two plants of the genus Corchorus ( C. olitorius and C. capsularis), of India. The fiber is also used in the manufacture of cordage.
Gunny bag or Gunny sack, a sack made of gunny or burlap, used for coarse commodities. In the southern U. S. similar sacks are called crocus sack, croker sack, towsack, and grass sack.