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English definition of “the crux”

the crux

noun [S] uk   /ˈkrʌks/ us  
the most important or serious part of a matter, problem, or argument: The crux of the country's economic problems is its foreign debt. The issue of an arms embargo will be at the crux of the negotiations in Geneva.Information and messages
(Definition of the crux from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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