also blue-grass, music style, 1958, in reference to the Blue Grass Boys, country music band 1940s-'50s, from the "blue" grass (Poa pratensis) characteristic of Kentucky. The grass so called from 1751; Kentucky has been the Bluegrass State at least since 1872; see blue (adj.1) + grass.
blue-blood
blue-chip
bluecoat
blue-collar
blue-eyed
bluegrass
blueing
blue-jacket
blue-jeans
blueness
blue-nose
