Noun
upright bass (plural upright basses)
(music) A double bass. (lowest-pitched of instruments of violin family)
Dorsey played the upright bass and steel guitar, as well as acoustic guitar. Johnny played acoustic guitar and together they were fabulous songwriters and singers. Jimmy Griffin
My mum's family would all get together, with guitars, harmonica, mandolins and upright bass and play old blues and folk songs. That was normal to me. Dan Auerbach