blue grass

(noun) any of various grasses of the genus Poa. Synonyms: bluegrass, blue grass.

(noun) an area in central Kentucky noted for it bluegrass and thoroughbred horses. Synonyms: Bluegrass, Bluegrass Country, Bluegrass Region.

(noun) a type of country music played at a rapid tempo on banjos and guitars. Synonyms: bluegrass.