nitty–gritty
/ˈnɪtiˌgrɪti/
noun
Britannica Dictionary definition of NITTY–GRITTY
the nitty-gritty
informal
:
the most important and basic facts or details about something
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He deals with the nitty-gritty of running the department.
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We finally got down to the nitty-gritty of the problem.
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Let's get down to the nitty-gritty and find out what happened.