Synonyms of 'crux'
He said the crux of the matter was economic policy.
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The core of something such as a problem or an issue is the part of it that has to be understood or accepted before the whole thing can be understood or dealt with.
He has the ability to get straight to the core of a problem.
Some claim that Ireland's very essence is expressed through its language.
Thesaurus for crux from the Collins English Thesaurus
The crux of a problem or argument is the most important or difficult part of it which affects everything else.