nitty-gritty

• n. 事实真相；本质
• adj. 根本的；详细的

词态变化

英文词源

nitty-gritty (n.)

"basic facts," 1961, knitty-gritty, American English, said to have been chiefly used by black jazz musicians, perhaps ultimately from nit and grits "finely ground corn." As an adjective from 1966.