The origin of the idiom "the nitty-gritty" is uncertain, but it is believed to have emerged in African American slang in the mid-20th century. It is derived from the term "nits and grits," which refers to the undesirable and tedious aspects of a task or situation. Over time, this expression evolved to represent the essential, detailed, and often less glamorous or appealing parts of a matter. It emphasizes getting down to the core or essence of something, leaving behind the superficial or peripheral aspects.

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