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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“The crux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20crux. Accessed 20 Sep. 2021.
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