Definition: nitty-gritty

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Source: WordNet (r) 1.7 

nitty-gritty
     n : the choicest or most essential or most vital part of some
         idea or experience: "the gist of the prosecutor's
         argument"; "the heart and soul of the Republican Party";
         "the nub of the story" [syn: kernel, substance, core,
          center, essence, gist, heart, heart and soul,
         inwardness, marrow, meat, nub, pith, sum]