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nitty-gritty

英 ['niti'ɡriti] 美

n. 事实真相；本质
adj. 根本的；详细的

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.