Etymology
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nitty-gritty (n.)

"basic facts of a situation or problem," by 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.

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nitty (adj.)
"full of nits," 1560s, from nit + -y (2).
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gritty (adj.)
1590s, "resembling or containing sand or grit," from grit (n.) + -y (2). In sense of "unpleasant" (of literature, etc.), from 1882, in reference to the sensation of eating gritty bread. Meaning "plucky, spirited, courageous and resolute" is from 1847. Related: Grittily; grittiness.
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sabulous (adj.)

"sandy, gritty," 1630s, from Latin sabulosus "sandy," from sabulum "coarse sand" (see sand (n.)). Related: Sabulosity.

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