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the crux
Definition of the crux
: the most important part of something (such as a problem, issue, puzzle, etc.) —usually + of The crux of the matter is that people are afraid of change. It's taken a while to get to the crux of the problem, but I think I finally understand it.
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cruxplay
: a puzzling or difficult problem : an unsolved question
: an essential point requiring resolution or resolving an outcome
: a main or central feature (as of an argument)
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